TS925
Rail-to-Rail High Output Current Quad Operational Amplifiers With Standby Mode and Adjustable Phantom Ground
Rail-to-rail input and output Low noise: 9nV/Hz Low distortion High output current: 80mA (able to drive 32 loads) High-speed: 4MHz, 1.3V/s Operating from 2.7V to 12V Low input offset voltage: 900V max. (TS925A) Adjustable phantom ground (VCC/2) Standby mode ESD internal protection: 2kV Latch-up immunity
N DIP16 (Plastic Package) D S O- 1 6 (Plastic Micropackage) P TSSOP16 (Thin Shrink Small Outline Package)
Description
The TS925 is a rail-to-rail quad BiCMOS operational amplifier optimized and fully specified for 3V and 5V operation. High output current allows low load impedances to be driven. An internal low impedance phantom ground eliminates the need for an external reference voltage or biasing arrangement. The TS925 exhibits very low noise, low distortion and high output current making this device an excellent choice for high quality, low voltage or batter y operated audio/telecom systems. The device is stable for capacitive loads up to 500pF. When the STANDBY mode is enabled, the total consumption drops to 6A (VCC = 3V). Pin connections (top view)
Output 1 Inverting Input 1 Non-inverting Input 1 V CC+ Non-inverting Input 2 Inverting Input 2 Output 2 Phantom ground
1 2 3 4 5 6 7 8 + + + + 14 13 12 11 10 9 16 15
Output 4 Inverting Input 4 Non-inverting Input 4 V CC Non-inverting Input 3 Inverting Input 3 Output 3 Stdby
Applications
Headphone amplifier Soundcard amplifier, piezoelectric speaker MPEG boards, multimedia systems...
Cordless telephones and portable communication equipment Line driver, buffer Instrumentation with low noise as key factor
November 2005
Rev 2 1/17
ww w.st .com
17
TS925
Order Codes
Part Number TS925IN TS925ID/IDT TS925IPT TS925AIN TS925AID TS925AIPT -40C to +125C Temperature Range Package DIP16 SO-16 TSSOP16 DIP16 SO-16 TSSOP16 Packing DIP16 SO-16 TSSO P16 DIP16 SO-16 TSSO P16 Marking TS925IN 925I TS925AIN 925AI
2/17
TS925
Absolute Maximum Ratings
1
Absolute Maximum Ratings
Table 1.
Symbol VCC Vi d Vi Tj Rthja
Key parameters and their absolute maximum ratings
Parameter Supply voltage (1) Differential Input Voltage (2) Input Voltage Maximum Junction Temperature SO-16 Thermal Resistance Junction to TSSOP16 Ambient DIP16 SO-16 Thermal Resistance Junction to TSSOP16 Case DIP16 HBM Human Body Model(3) MM Machine Model(4) CDM Charged Device Model Output Short Circuit Duration Latch-up Immunity Soldering Temperature 10sec, Pb-free package Condition Value 14 1 VDD -0.3 to VCC+0.3 150 95 95 63 30 25 33 2 200 1 see note(5) 200 260 mA C Un i t V V V C C/W
Rthjc
C/W
kV V kV
ESD
Electro-Static Discharge
1. All voltage values, except differential voltage are with respect to network ground terminal. 2. Differential voltages are the non-inverting input terminal with respect to the inverting input terminal. If Vid > 1V, the maximum input current must not exceed 1mA. In this case (Vid > 1V) an input serie resistor must be added to limit input current. 3. Human body model, 100pF discharged through a 1.5k resistor into pin of device. 4. Machine model ESD, a 200pF cap is charged to the specified voltage, then discharged directly into the IC with no external series resistor (internal resistor < 5), into pin to pin of device. 5. There is no short-circuit protection inside the device: short-circuits from the output to Vcc can cause excessive heating. The maximum output current is approximately 80mA, independent of the magnitude of Vcc. Destructive dissipation can result from simultaneous short-circuits on all amplifiers.
Table 2.
Symbol VCC V i cm Toper
Operating conditions
Parameter Supply Voltage Com mon Mode Input Voltage Range Operating Free Air Temperature Range Value 2.7 to 12 VDD -0.2 to VCC +0.2 -40 to +125 Unit V V C
3/17
Electrical Characteristics
TS925
2
Electrical Characteristics
Table 3.
Symbol Vio
Electrical characteristics for VCC = 3V, VDD = 0V, Vicm = VCC/2, RL connected to VCC/2, Tamb = 25C (unless otherwise specified)
Parameter Input Offset Voltage Conditions a t T a mb = + 2 5 C TS925 TS925A at Tmin. Tamb Tmax: TS925 TS925A 3 0.9 5 1.8 2 Vout = 1.5V Vout = 2.5V RL = 10k RL = 600 RL = 3 2 RL = 10k RL = 600 RL = 3 2 Vout = 2Vpk-pk RL = 10k RL = 600 RL = 3 2 RL = 600 60 Vcc = 2.7 to 3.3V 60 50 0.7 RL = 600, CL =100pF RL = 600, CL =100pF f = 1kHz Vout = 2Vpk-pk, f = 1kHz, Av = 1, RL = 600 2.90 2.87 2.63 50 100 180 1 15 30 100 V/C nA nA Mi n . Typ. M ax. Unit
mV
DV io Iio Iib VOH
Input Offset Voltage Drift Input Offset Current Input Bias Current High Level Output Voltage
V
VO L
Low Level Output Voltage
mV
Avd
Large Signal Voltage Gain
200 35 16 4 80 85 80 1.3 68 12 9
V/ mV
G BP CM R SVR Io SR Pm GM en T HD
Gain Bandwidth Product Common Mode Rejection Ratio Supply Voltage Rejection Ratio Output Short-Circuit Current Slew Rate Phase Margin at Unit Gain Gain Margin Equivalent Input Noise Voltage Total Harmonic Distortion
M Hz dB dB mA V/s Degrees dB
nV ----------Hz
0.01
%
Cs
Channel Separation
120
dB
4/17
TS925
Table 4.
Symbol ICC Istby
Electrical Characteristics
Global circuit
Parameter Total Supply Current Total Supply Current in STANDBY
(1)
Conditions No load, Vout = Vcc/2 Pin 9 connected to Vccat Tamb = +25C at Tmin T amb Tmax at Tamb = +25C at Tmin T amb Tmax
Mi n .
Typ 5 6
M ax. 7
Un i t mA A
Venstby Pin 9 Voltage to enable the STANDBY mode Vdistby Pin 9 Voltage to disable the STANDBY mode (1)
0.3 0.4 1.1 1
V
V
1. The STANDBY mode is currently enabled when Pin 9 is GROUNDED and disabled when Pin 9 is left OPEN.
Table 5.
S y mb o l Vpg Ipgsc Zpg Enpg
Phantom ground
Parameter Phantom Ground Output Voltage Phantom Ground Output Short Circuit Current - Sourced Phantom Ground Impedance Phantom Ground Output Voltage Noise DC to 20kHz f = 1kHz Cdec = 100pF Cdec = 1nF Cdec = 10nF(1) 12 Conditions No Output Current Min. Vcc/2 -5% 12 Typ V cc/2 Ma x . Vcc/2 +5% Unit V mA
nV ----------Hz
18 3
200 40 17 18
Ipgsk
Phantom Ground Output Short Circuit Current - Sinked
mA
1. Cdec is the decoupling capacitor on Pin9.
5/17
Electrical Characteristics
Table 6.
Symbol Vio
TS925
Electrical characteristics for VCC = 5V, V DD = 0V, Vicm = VCC/2, RL connected to VCC/2, Tamb = 25C (unless otherwise specified)
Parameter Input Offset Voltage Conditions at T amb = +25C: TS925 TS925A at T min. T amb Tmax: TS925 TS925A 3 0.9 5 1.8 2 Vout = 2.5V Vout = 2.5V RL= 10k RL = 600 RL = 32 RL= 10k RL = 600 RL = 32 Vout = 2Vpk-pk RL= 10k RL = 600 RL = 32 200 40 17 4 60 Vcc = 3 to 5V 60 50 0. 7 RL = 600, CL =100pF RL = 600, CL =100pF f = 1kHz Vout = 2V pk-pk, f = 1kHz, Av = 1, RL = 600 80 85 80 1. 3 68 12 9 0.01 120 V/mV 4.90 4.85 4. 4 50 120 300 1 15 30 100 V/ C nA nA mV Min. Typ. Ma x . Unit
DV io Iio Iib VOH
Input Offset Voltage Drift Input Offset Current Input Bias Current High Level Output Voltage
V
VO L
Low Level Output Voltage
mV
Avd
Large Signal Voltage Gain
G BP CM R SVR Io SR Pm GM en T HD Cs
Gain Bandwidth Product Common Mode Rejection Ratio Supply Voltage Rejection Ratio Output Short-Circuit Current Slew Rate Phase Margin at Unit Gain Gain Margin Equivalent Input Noise Voltage Total Harmonic Distortion Channel Separation
RL = 600
MH z dB dB mA V/s Degrees dB
nV ----------Hz
% dB
6/17
TS925
Table 7.
Symbol ICC Istby Venstby Vdistby
Electrical Characteristics
Global circuit
Parameter Total Supply Current Total Supply Current in STANDBY Pin 9 Voltage to enable the STANDBY mode
(1)
Conditions No load, Vout = Vcc/2 Pin 9 connected to Vccat Tamb = +25C at Tmin Tamb Tmax at Tamb = +25C at Tmin Tamb Tmax
Min.
Typ 6 6
Max. 8
Unit mA A
0.3 0.4 1.1 1
V
Pin 9 Voltage to disable the STANDBY mode (1)
V
1. the STANDBY mode is currently enabled when Pin 9 is GROUNDED and disabled when Pin 9 is left OPEN.
Table 8.
S y mb o l Vpg Ipgsc Zpg
Phantom ground
Parameter Phantom Ground Output Voltage Phantom Ground Output Short Circuit Current - Sourced Phantom Ground Impedance Phantom Ground Output Voltage Noise Phantom Ground Output Short Circuit Current - Sinked DC to 20kHz f = 1kHz Cdec = 100pF Cdec = 1nF Cdec = 10nF(1) 12 Conditions No Output Current Mi n . Vcc/2 - 5% 12 Typ Vcc/2 Ma x . V cc/2 +5% Uni t V mA
nV ----------Hz
18 3
Enpg
200 40 17 18
Ipgsk
mA
1. Cdec is the decoupling capacitor on Pin9.
7/17
Electrical Characteristics
Figure 1. Input offset voltage distribution Figure 2.
TS925
Total supply current vs. supply voltage with no load
Figure 3.
Supply current/amplifier vs. temperature
Figure 4.
Output short circuit current vs. output voltage
Figure 5.
Output short circuit current vs. output voltage
Figure 6.
Output short circuit current vs. output voltage
8/17
TS925
Figure 7. Output short circuit current vs. temperature Figure 8.
Electrical Characteristics
Voltage gain and phase vs. frequency
Figure 9.
Distortion + noise vs. frequency
Figure 10. THD + noise vs. frequency
Figure 11. TH D + noise vs. frequency
Figure 12. THD + noise vs. frequency
9/17
Electrical Characteristics
Figure 13. Equivalent input noise vs. frequency
TS925
Figure 14. Total supply current vs. standby input voltage
Figure 15. Phantom ground short circuit output current vs. phantom ground output voltage
10/17
TS925
Using the TS925 as a preamplifier and speaker driver
3
Using the TS925 as a preamplifier and speaker driver
The TS925 is an input/output rail-to-rail quad BiCMOS operational amplifier. It is able to operate with low supply voltages (2.7V) and to drive low output loads such as 32. As an illustration of these features, the following technical note highlights many of the advantages of the device in a global audio application.
3.1
Application circuit
Figure 16 shows two operators (A1, A4) used in a preamplifier configuration, and the two others in a push-pull configuration driving a headset. The phantom ground is used as a common reference level (VCC/2).
The power supply is delivered from two LR6 batteries (2 x 1.5V nominal).
Preamplifier
The operators A1 and A4 are wired with a non-inverting gain of respectively: · A1# (R4/(R3+R17)) · A4# R6/R5 W ith the following values chosen: · R4 = 22k - R3 = 50 - R17 = 1.2k · R6 = 47k - R5 = 1.2k, The gain of the preamplifier chain is therefore equal to 58dB. Alter natively, the gain of A1 can be adjusted by choosing a JFET transistor Q1 instead of R17. This JFET voltage controlled resistor arrangement forms an automatic level control (ALC) circuit, useful in many microphone preamplifier applications. The mean rectified peak level of the output signal envelope is used to control the preamplifier gain.
11/17
Using the TS925 as a preamplifier and speaker driver
Figure 16. Electrical schematic
M ik e p r e a m p lif ie r C9 M IC R O P H O N E
TS925
C1
M IK E OUTPUT
R2
C4 C14
R3
R5
C6
C2 C3 ALC
R 18 R 17
C5
D1
D2
R8
Vcc P H A N TO M G R O U N D 8 4 9 13
C15 C10 C 18 C 8
R7
Q1
C7
STBY
C9
R 11 R 12 R 10 R 13
C 12 7 HE AD PHO NE S
6
R 15
5 C 13 11 10 12
C 10
H e a d p h o n e s a m p l if ie r A M P L IF IE R IN P U T LEFT
C 11
R16
A M P L IF IE R IN P U T R IG H T
Headphone amplifier
The operators A2 and A3 are organized in a push-pull configuration with a gain of 5. The stereo inputs can be connected to a CD-player and the TS925 can directly drive the head-phone speakers. This configuration shows the ability of the circuit to drive 32 load with a maximum output swing and high fidelity suitable for sound and music.
Figure 19 shows the available signal swing at the headset outputs: two other rail-to-rail competitor parts are employed in the same circuit for comparison (note the much reduced clipping level and crossover distortion).
12/17
TS925
Using the TS925 as a preamplifier and speaker driver
Figure 18. Voltage noise density vs. frequency at preamplifier output
15
Figure 17. Frequency response of the global preamplifier chain
70
14
N o is e D e n s i t y ( n V / s q r t ( H z ) )
60
13 12 11 10 9 8
V o l t a g e G a i n ( d B)
50
40
30
20 1 00
1 00 0
1 00 00
1 00 0 00
1 00 0 00 0
1 00 0 00 00
1 .0 E + 0 8
7 10 100 1000 1 0 00 0 1 0 00 0 0
f r e q u e n c y (Hz)
fre q u e n c y ( H z )
Figure 19. Maximum voltage swing at headphone outputs (RL = 32)
Figure 20. THD + noise vs. frequency (headphone outputs)
0 .4 0.3 5 0 .3
T HD+ n o i se (%)
0.2 5 0 .2 0.1 5 0 .1 0.0 5 0 100
1 0 00
10000
1 0 0 0 00
Hz
13/17
Package Mechanical Data
TS925
4
Package Mechanical Data
In order to meet environmental requirements, ST offers these devices in ECOPACK packages. These packages have a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
4.1
DIP16 Package
Plastic DIP-16 (0.25) MECHANICAL DATA
mm. DIM. MIN. a1 B b b1 D E e e3 F I L Z 3.3 1.27 8.5 2.54 17.78 7.1 5.1 0.130 0.050 0.51 0.77 0.5 0.25 20 0.335 0.100 0.700 0.280 0.201 1.65 TYP MAX. MIN. 0.020 0.030 0.020 0.010 0.787 0.065 TYP. MAX. inch
P001C
14/17
TS925
Package Mechanical Data
4.2
SO-16 Package
SO-16 MECHANICAL DATA
DIM. A a1 a2 b b1 C c1 D E e e3 F G L M S 8 3.8 4.6 0.5 9.8 5.8 1.27 8.89 4.0 5.3 1.27 0.62 (max.) 0.149 0.181 0.019 10 6.2 0.35 0.19 0.5 45 (typ.) 0.385 0.228 0.050 0.350 0.157 0.208 0.050 0.024 0.393 0.244 0.1 mm. MIN. TYP MAX. 1.75 0.2 1.65 0.46 0.25 0.013 0.007 0.019 0.004 MIN. inch TYP. MAX. 0.068 0.008 0.064 0.018 0.010
PO13H
15/17
Package Mechanical Data
TS925
4.3
TSSOP16 Package
TSSOP16 MECHANICAL DATA
mm. DIM. MIN. A A1 A2 b c D E E1 e K L 0 0.45 0.60 0.05 0.8 0.19 0.09 4.9 6.2 4.3 5 6.4 4.4 0.65 BSC 8 0.75 0 0.018 0.024 1 TYP MAX. 1.2 0.15 1.05 0.30 0.20 5.1 6.6 4.48 0.002 0.031 0.007 0.004 0.193 0.244 0.169 0.197 0.252 0.173 0.0256 BSC 8 0.030 0.004 0.039 MIN. TYP. MAX. 0.047 0.006 0.041 0.012 0.0079 0.201 0.260 0.176 inch
A
A2 A1 b e K c L E
D
E1
PIN 1 IDENTIFICATION
1
0080338D
16/17
TS925
Revision History
5
Revision History
Date Feb. 2001 Revision 1 Chang es Initial release - Product in full production. The following changes were made in this revision: Chapter on Macromodels removed from the datasheet. Data updated in Table 3. on page 4. Data in tables in Electrical Characteristics on page 4 reformatted for easier use. Minor grammatical and formatting changes throughout.
Nov. 2005
2
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners 2005 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com
17/17
|
