THS7001, THS7002

70-MHz PROGRAMMABLE-GAIN AMPLIFIERS

SLOS214B – OCTOBER 1998 – REVISED AUGUST 1999

1

POST OFFICE BOX 655303

Stages

– Low Voltage Noise . . . 1.7 nV/

√Hz

– Accessible Output Pin for External

Filtering

– 100 MHz Bandwidth (–3 dB)

– Digitally Programmable Gain

– –22 dB to 20 dB Gain/Attenuation Range

– 6 dB Step Resolution

– Output Clamp Protection

– 70 MHz Bandwidth (–3 dB)

– 175 V/

µs Slew Rate

Thermal Performance

description

The THS7001 (single) and THS7002 (dual) are high-speed programmable-gain amplifiers, ideal for applications

where load impedance can often vary. Each channel on this device consists of a separate low-noise input

preamp and a programmable gain amplifier (PGA). The preamp is a voltage-feedback amplifier offering a low

1.7-nV/

√Hz voltage noise with a 100-MHz (–3 dB) bandwidth. The output pin of the preamp is accessible so that

filters can be easily added to the amplifier.

The 3-bit digitally-controlled PGA provides a –22-dB to 20-dB attenuation/gain range with a 6-dB step

resolution. In addition, the PGA provides both high and low output clamp protection to prevent the output signal

from swinging outside the common-mode input range of an analog-to-digital converter. The PGA provides a

wide 70-MHz (–3 dB) bandwidth, which remains relatively constant over the entire gain/attenuation range.

Independent shutdown control is also provided for power conservation and multiplexing. These devices operate

over a wide

±4.5-V to ±16-V supply voltage range.

_

+

PREAMP VCC+

PREAMP IN+

PREAMP IN–

PREAMP VCC–

Preamp

PREAMP

OUT

PGA IN–

G2

G1

G0

PGA REF

SHDN

PGA

VCC+

GND

PGA

VCC–

CLAMP+ (VH)

CLAMP– (VL)

PGA OUT

_

+

Figure 1. THS7001 Block Diagram

Copyright

© 1999, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

CAUTION: The THS7001 and THS7002 provides ESD protection circuitry. However, permanent damage can still occur if this

device is subjected to high-energy electrostatic discharges. Proper ESD precautions are recommended to avoid any performance

degradation or loss of functionality.

PowerPAD is a trademark of Texas Instruments Incorporated.