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 32Ω
loads)
■ High-speed: 4MHz, 1.3V/µs
■ Operating from 2.7V to 12V
■ Low input offset voltage: 900µV max. (TS925A)
■ Adjustable phantom ground (V
■ Standby mode
■ ESD internal protection: 2kV
■ Latch-up immunity
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
battery 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 6µA (V
CC
CC
/2)
= 3V).
Output 1
Inverting
Input 1
Non-inverting
Input 1
V
CC
Non-inverting
Input 2
Inverting
Input 2
Output 2
Phantom ground
TS925
N
DIP16
(Plastic Package)
D
SO-16
(Plastic Micropackage)
P
TSSOP16
(Thin Shrink Small Outline Package)
Pin connections (top view)
16
15
14
13
12
11
10
9
Output 4
Inverting
Input 4
Non-inverting
Input 4
-
V
CC
Non-inverting
Input 3
Inverting
Input 3
Output 3
Stdby
1
2
3
+
4
5
6
7
8
-
+
-
-
+
+
+
-
Applications
■ Headphone amplifier
■ Soundcard amplifier, piezoelectric speaker
■ MPEG boards, multimedia systems...
November 2005 1/17
■ Cordless telephones and portable
communication equipment
■ Line driver, buffer
■ Instrumentation with low noise as key factor
Rev 2
www.st.com
17
Order Codes
Part Number Temperature Range Package Packing Marking
TS925
TS925IN
TS925ID/IDT SO-16 SO-16
TS925IPT TSSOP16 TSSOP16
TS925AIN DIP16 DIP16 TS925AIN
TS925AID SO-16 SO-16
TS925AIPT TSSOP16 TSSOP16
-40°C to +125°C
DIP16 DIP16 TS925IN
925I
925AI
2/17
TS925 Absolute Maximum Ratings
1 Absolute Maximum Ratings
Table 1. Key parameters and their absolute maximum ratings
Symbol Parameter Condition Value Unit
VCC
Vid
V
T
R
thja
R
thjc
Supply voltage
Differential Input Voltage
Input Voltage
i
Maximum Junction Temperature 150 °C
j
Thermal Resistance Junction to
Ambient
Thermal Resistance Junction to
Case
(1)
ESD Electro-Static Discharge
Output Short Circuit Duration
Latch-up Immunity 200 mA
Soldering Temperature
(2)
SO-16
TSSOP16
DIP16
SO-16
TSSOP16
DIP16
HBM
Human Body Model
(3)
MM
Machine Model
(4)
CDM
Charged Device Model
10sec,
Pb-free package
14 V
±1 V
-0.3 to VCC+0.3
V
DD
95
95
63
30
25
33
2kV
200 V
1kV
see note
260 °C
V
°C/W
°C/W
(5)
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 1.5kΩ 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 < 5Ω), into pin to pin of device.
5. There is no short-circuit protection inside the device: short-circuits from the output to V
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.
can cause excessive
cc
Table 2. Operating conditions
Symbol Parameter Value Unit
T
V
V
oper
Supply Voltage 2.7 to 12 V
CC
V
Common Mode Input Voltage Range
icm
-0.2 to VCC +0.2
DD
Operating Free Air Temperature Range -40 to +125 °C
V
3/17
Electrical Characteristics TS925
2 Electrical Characteristics
Table 3. Electrical characteristics for VCC=3V, VDD=0V, V
to V
CC
/2, T
= 25°C (unless otherwise specified)
amb
icm=VCC
/2, RL connected
Symbol Parameter Conditions Min. Typ. Max. Unit
V
Input Offset Voltage at T
io
DV
V
Input Offset Voltage Drift 2 µV/°C
io
I
Input Offset Current
io
I
Input Bias Current
ib
High Level Output Voltage RL=10kΩ
OH
V
Low Level Output Voltage RL=10kΩ
OL
A
Large Signal Voltage Gain V
vd
GBP Gain Bandwidth Product
at T
V
V
R
R
R
R
RL=10kΩ
R
R
R
amb
TS925
TS925A
min.
TS925
TS925A
=1.5V
out
=2.5V
out
=600Ω
L
=32Ω
L
=600Ω
L
=32Ω
L
= 2V
out
=600Ω
L
=32Ω
L
= 600Ω
L
=+25°C
≤ T
amb
pk-pk
≤ T
max
3
0.9
:
mV
5
1.8
130 nA
15 100 nA
2.90
2.87
2.63
50
100 mV
180
200
35
V/mV
16
4MHz
CMR Common Mode Rejection Ratio 60 80 dB
V
SVR Supply Voltage Rejection Ratio
I
Output Short-Circuit Current 50 80 mA
o
Vcc = 2.7 to 3.3V
SR Slew Rate 0.7 1.3 V/µs
Pm Phase Margin at Unit Gain
GM Gain Margin
e
Equivalent Input Noise Voltage f = 1kHz 9
n
R
R
THD Total Harmonic Distortion V
f=1kHz, A
R
C
Channel Separation
s
4/17
= 600Ω, CL =100pF
L
= 600Ω, CL =100pF
L
=2V
out
=600Ω
L
pk-pk
v
,
=1,
60 85 dB
68 Degrees
12 dB
nV
-----------Hz
0.01 %
120 dB
TS925 Electrical Characteristics
Table 4. Global circuit
Symbol Parameter Conditions Min. Typ Max. Unit
I
Total Supply Current No load, V
CC
I
Total Supply Current in STANDBY Pin 9 connected to V
stby
V
V
1. The STANDBY mode is currently enabled when Pin 9 is GROUNDED and disabled when Pin 9 is left OPEN.
Pin 9 Voltage to enable the
enstby
STANDBY mode
Pin 9 Voltage to disable the
distby
STANDBY mode
(1)
(1)
at T
at T
at T
at T
amb
min
amb
min
Table 5. Phantom ground
Symbol Parameter Conditions Min. Typ Max. Unit
V
Phantom Ground Output Voltage No Output Current
pg
out
=+25°C
≤ T
amb
=+25°C
≤ T
amb
= V
≤ T
≤ T
cc/2
max
max
cc-
1.1
V
-5%
57mA
6 µA
0.3
0.4
1
V
cc/2
cc/2 Vcc/2
+5%
V
V
V
I
E
I
1. C
Phantom Ground Output Short
pgsc
Circuit Current - Sourced
Z
Phantom Ground Impedance
pg
Phantom Ground Output Voltage
npg
Noise
Phantom Ground Output Short
pgsk
Circuit Current - Sinked
is the decoupling capacitor on Pin9.
dec
DC to 20kHz
f=1kHz
= 100pF
C
dec
C
= 1nF
dec
C
= 10nF
dec
(1)
12 18 mA
3 Ω
200
40
nV
------------
Hz
17
12 18 mA
5/17
Electrical Characteristics TS925
Table 6. Electrical characteristics for VCC = 5V, VDD = 0V, V
to V
CC
/2, T
= 25°C (unless otherwise specified)
amb
= VCC/2, RL connected
icm
Symbol Parameter Conditions Min. Typ. Max. Unit
V
Input Offset Voltage at T
io
DV
V
Input Offset Voltage Drift
io
Input Offset Current V
I
io
I
Input Bias Current V
ib
High Level Output Voltage RL= 10kΩ
OH
V
Low Level Output Voltage RL= 10kΩ
OL
A
Large Signal Voltage Gain V
vd
GBP Gain Bandwidth Product
at T
R
R
R
R
RL=10k
R
R
R
amb
TS925
TS925A
min.
TS925
TS925A
= 2.5V
out
= 2.5V
out
= 600Ω
L
= 32Ω
L
= 600Ω
L
= 32Ω
L
= 2V
out
= 600Ω
L
= 32Ω
L
= 600Ω
L
=+25°C:
≤ T
amb
pk-pk
≤ T
max
3
0.9
:
mV
5
1.8
2 µV/°C
130 nA
15 100 nA
4.90
4.85
4.4
50
120 mV
300
200
40
V/mV
17
4MHz
CMR Common Mode Rejection Ratio 60 80 dB
V
SVR Supply Voltage Rejection Ratio
I
Output Short-Circuit Current 50 80 mA
o
V
SR Slew Rate 0.7 1.3 V/µs
Pm Phase Margin at Unit Gain
GM Gain Margin
e
Equivalent Input Noise Voltage f = 1kHz 9
n
THD Total Harmonic Distortion
C
Channel Separation
s
R
R
V
A
6/17
= 3 to 5V
cc
= 600Ω, CL =100pF
L
= 600Ω, CL =100pF
L
= 2V
out
=1, RL= 600Ω
v
pk-pk
, f = 1kHz,
60 85 dB
68 Degrees
12 dB
nV
-----------Hz
0.01 %
120 dB
TS925 Electrical Characteristics
Table 7. Global circuit
Symbol Parameter Conditions Min. Typ Max. Unit
I
Total Supply Current
CC
Total Supply Current in
I
stby
STANDBY
V
V
1. the STANDBY mode is currently enabled when Pin 9 is GROUNDED and disabled when Pin 9 is left OPEN.
Pin 9 Voltage to enable the
enstby
STANDBY mode
Pin 9 Voltage to disable the
distby
STANDBY mode
(1)
(1)
No load, V
Pin 9 connected to V
at T
amb
at T
min
at T
amb
at T
min
out
=+25°C
≤ T
amb
=+25°C
≤ T
amb
= V
≤ T
≤ T
cc/2
max
max
cc-
1.1
1
68
6
0.3
0.4
mA
µA
Table 8. Phantom ground
Symbol Parameter Conditions Min. Typ Max. Unit
V
I
pgsc
Z
E
I
pgsk
Phantom Ground Output
pg
Voltage
No Output Current
V
-5%
Phantom Ground Output Short
Circuit Current - Sourced
Phantom Ground Impedance DC to 20kHz 3 Ω
pg
V
cc/2
12 18 mA
f=1kHz
Phantom Ground Output
npg
Voltage Noise
Phantom Ground Output Short
Circuit Current - Sinked
C
dec
C
dec
C
dec
= 100pF
= 1nF
= 10nF
200
(1)
12 18 mA
40
17
cc/2
V
cc/2
+5%
------------
V
V
V
nV
Hz
1. C
is the decoupling capacitor on Pin9.
dec
7/17
Electrical Characteristics TS925
Figure 1. Input offset voltage distribution Figure 2. Total supply current vs. supply
voltage with no load
Figure 3. Supply current/amplifier vs.
temperature
Figure 5. Output short circuit current vs.
output voltage
Figure 4. Output short circuit current vs.
output voltage
Figure 6. Output short circuit current vs.
output voltage
8/17
TS925 Electrical Characteristics
Figure 7. Output short circuit current vs.
temperature
Figure 9. Distortion + noise vs. frequency Figure 10. THD + noise vs. frequency
Figure 8. Voltage gain and phase vs.
frequency
Figure 11. THD + noise vs. frequency Figure 12. THD + noise vs. frequency
9/17
Electrical Characteristics TS925
Figure 13. Equivalent input noise vs.
frequency
Figure 15. Phantom ground short circuit
output current vs. phantom
ground output voltage
Figure 14. Total supply current vs. standby
input 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 32Ω.
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
in a push-pull configuration driving a headset. The phantom ground is used as a common
reference level (V
The power supply is delivered from two LR6 batteries (2 x 1.5V nominal).
shows two operators (A1, A4) used in a preamplifier configuration, and the two others
/2).
CC
Preamplifier
The operators A1 and A4 are wired with a non-inverting gain of respectively:
• A1# (R4/(R3+R17))
• A4# R6/R5
With the following values chosen:
• R4 = 22kΩ -R3=50Ω -R17=1.2kΩ
• R6 = 47kΩ -R5=1.2kΩ,
The gain of the preamplifier chain is therefore equal to 58dB.
Alternatively, 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 TS925
Mik
lifi
Figure 16. Electrical schematic
MICROPHONE
HEAD PHO NES
C14
C1
C12
C13
R2
C2
R8
PHANTOM GROUND
C9
7
1010
e preamp
R3
C3
R18
R17
6
5
11
12
Q1
R10
C4
ALC
R11
er
C9
R5
C5
C7
Vcc
4
8
9
C15 C10
13
R12
R13
C10
R15
C11
R16
C6
D1
R7
C18 C8
Headphones am plifier
D2
MIKE
OUTPUT
STBY
AMPLIFIER
INP U T
LEFT
AMPLIFIER
INP U T
RIGHT
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 32Ω load with a maximum
output swing and high fidelity suitable for sound and music.
Figure 19
competitor parts are employed in the same circuit for comparison (note the much reduced
clipping level and crossover distortion).
shows the available signal swing at the headset outputs: two other rail-to-rail
12/17
TS925 Using the TS925 as a preamplifier and speaker driver
)
G
i
(
)
Figure 17. Frequency response of the global
preamplifier chain
70
60
dB
50
n
a
40
Voltage
30
20
100 1000 10000 100000 1000000 10000000 1.0E+08
frequency (Hz
Figure 19. Maximum voltage swing at
headphone outputs (R
= 32Ω)
L
Figure 18. Voltage noise density vs.
frequency at preamplifier output
15
14
13
12
11
ensity (nV /sqrt(Hz))
10
Noise D
9
8
7
10 100 1000 10000 100000
frequency (Hz)
Figure 20. THD + noise vs. frequency
(headphone outputs)
0.4
0.35
0.3
0.25
ise (%)
0.2
0.15
THD+no
0.1
0.05
0
100 1000 10000 100000
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
DIM.
a1 0.51 0.020
B 0.77 1.65 0.030 0.065
b 0.5 0.020
b1 0.25 0.010
D 20 0.787
E 8.5 0.335
e 2.54 0.100
e3 17.78 0.700
F 7.1 0.280
I 5.1 0.201
L 3.3 0.130
Z 1.27 0.050
MIN. TYP MAX. MIN. TYP. MAX.
mm. inch
14/17
P001C
TS925 Package Mechanical Data
4.2 SO-16 Package
SO-16 MECHANICAL DATA
DIM.
A 1.75 0.068
a1 0.1 0.2 0.004 0.008
a2 1.65 0.064
b 0.35 0.46 0.013 0.018
b1 0.19 0.25 0.007 0.010
C 0.5 0.019
c1 45˚ (typ.)
D 9.8 10 0.385 0.393
E 5.8 6.2 0.228 0.244
e 1.27 0.050
e3 8.89 0.350
F 3.8 4.0 0.149 0.157
G 4.6 5.3 0.181 0.208
L 0.5 1.27 0.019 0.050
M 0.62 0.024
S8 ˚ (max.)
MIN. TYP MAX. MIN. TYP. MAX.
mm. inch
PO13H
15/17
Package Mechanical Data TS925
4.3 TSSOP16 Package
TSSOP16 MECHANICAL DATA
DIM.
A 1.2 0.047
A1 0.05 0.15 0.002 0.004 0.006
A2 0.8 1 1.05 0.031 0.039 0.041
b 0.19 0.30 0.007 0.012
c 0.09 0.20 0.004 0.0079
D 4.9 5 5.1 0.193 0.197 0.201
E 6.2 6.4 6.6 0.244 0.252 0.260
E1 4.3 4.4 4.48 0.169 0.173 0.176
e 0.65 BSC 0.0256 BSC
K0˚ 8˚0˚ 8˚
L 0.45 0.60 0.75 0.018 0.024 0.030
A
MIN. TYP MAX. MIN. TYP. MAX.
A2
A1
mm. inch
b
e
c
K
L
E
D
PIN 1 IDENTIFICATION
1
16/17
E1
0080338D
TS925 Revision History
5 Revision History
Date Revision Changes
Feb. 2001 1 Initial release - Product in full production.
The following changes were made in this revision:
– Chapter on Macromodels removed from the datasheet.
Nov. 2005 2
– Data updated in
– Data in tables in
Table 3. on page 4
Electrical Characteristics on page 4
easier use.
– Minor grammatical and formatting changes throughout.
.
reformatted for
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
Loading...