TS925 STMICROELECTRONICS | Alldatasheet
Document overview
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Technical content
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 (VCC/2) ■ 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 6 µA (V CC = 3V).
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 4 13 + - +- -+ Output 1 Inverting Input 1 Non-inverting Input 1 VCC+ VCC- Non-inverting Input 2 Inverting Input 2 Output 2 Phantom ground Output 4 Inverting Input 4 Non-inverting Input 4 Non-inverting Input 3 Inverting Input 3 Output 3 Stdby N DIP16 (Plastic Package) Pin connections (top view) D SO-16 (Plastic Micropackage) P TSSOP16 (Thin Shrink Small Outline Package)
Part Number Temperature Range Package Packing Marking TS925IN -40°C to +125°C DIP16 DIP16 TS925IN TS925ID/IDT SO-16 SO-16 925I TS925IPT TSSOP16 TSSOP16 TS925AIN DIP16 DIP16 TS925AIN TS925AID SO-16 SO-16 925AI TS925AIPT TSSOP16 TSSOP16
1 Absolute Maximum Ratings
Table 1. Key parameters and their absolute maximum ratings Table 2. Operating conditions
- All voltage values, except differential voltage are with respect to network ground terminal.
- Differential voltages are the non-inverting input terminal with respect to the inverting input terminal. If Vid > ±1V,
added to limit input current.
- Human body model, 100pF discharged through a 1.5k Ω resistor into pin of device.
- 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 Ω), into pin to pin of device.
- There is no short-circuit protection inside the device: short-circuits from the output to V cc
dissipation can result from simultaneous short-circuits on all amplifiers.
2 Electrical Characteristics
Table 3. Electrical characteristics for V CC =3 V , VDD =0 V , Vicm =V CC/2, RL connected
Table 4. Global circuit Table 5. Phantom ground
- The STANDBY mode is currently enabled when Pin 9 is GROUNDED and disabled when Pin 9 is left OPEN.
- C dec is the decoupling capacitor on Pin9.
Table 6. Electrical characteristics for V CC = 5V, VDD = 0V, Vicm = VCC/2, RL connected
Table 7. Global circuit Table 8. Phantom ground
- the STANDBY mode is currently enabled when Pin 9 is GROUNDED and disabled when Pin 9 is left OPEN.
- C dec is the decoupling capacitor on Pin9.
TS925 Using the TS925 as a preamplifier and speaker driver
3 Using the TS925 as a preamplifier and speaker
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 Ω. 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 (V CC/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:
- A4# R6/R5 With the following values chosen:
- R4 = 22kΩ -R 3=5 0 Ω -R 1 7=1 . 2 kΩ
- R6 = 47kΩ -R 5=1 . 2 kΩ, 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.
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:
4.1 DIP16 P ackage
DIM. mm. inch 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 Plastic DIP-16 (0.25) MECHANICAL DATA P001C
4.2 SO-16 Package
DIM. mm. inch 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 ˚ ( m a x . ) SO-16 MECHANICAL DATA PO13H
4.3 TSSOP16 Package
DIM. mm. inch A 1.2 0.047 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0079 e 0.65 BSC 0.0256 BSC K0 ˚ 8 ˚0 ˚ 8 ˚ TSSOP16 MECHANICAL DATA c Eb A2A D PIN 1 IDENTIFICATION LKe 0080338D
5 Revision History
Feb. 2001 1 Initial release - Product in full production. Nov. 2005 2 The following changes were made in this revision: – Chapter on Macromodels removed from the datasheet. – Data updated in T able 3. on page 4. – Data in tables in Electrical Characteristics on page 4 reformatted for easier use. – Minor grammatical and formatting changes throughout. 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 p ublication 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 STMicr oelectronics. 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 - Ital y - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America