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AD8138:  Low Distortion Differential ADC Driver

The AD8138 is a major advancement over op amps for differential signal processing. The AD8138 can be used as a single-ended-to-differential amplifier or as a differential-to-differential amplifier. The AD8138 is as easy to use as an op amp, and greatly simplifies differential signal amplification and driving. Manufactured on ADI's proprietary XFCB bipolar process, the AD8138 has a -3 dB bandwidth ...More

AD8138:  Low Distortion Differential ADC Driver

Product Description

The AD8138 is a major advancement over op amps for differential signal processing. The AD8138 can be used as a single-ended-to-differential amplifier or as a differential-to-differential amplifier. The AD8138 is as easy to use as an op amp, and greatly simplifies differential signal amplification and driving. Manufactured on ADI's proprietary XFCB bipolar process, the AD8138 has a -3 dB bandwidth of 320 MHz and delivers a differential signal with the lowest harmonic distortion available in a differential amplifier. The AD8138 has a unique internal feedback feature that provides balanced output gain and phase matching, suppressing even order harmonics. The internal feedback circuit also minimizes any gain error that would be associated with the mismatches in the external gain setting resistors.

The AD8138's differential output helps balance the input to differential ADCs, maximizing the performance of the ADC. The AD8138 eliminates the need for a transformer with high performance ADCs, preserving the low frequency and dc information. The common-mode level of the differential output is adjustable by a voltage on the VOCM pin, easily level-shifting the input signals for driving single supply ADCs. Fast overload recovery preserves sampling accuracy.

The AD8138 distortion performance makes it an ideal ADC driver for communication systems, with distortion performance good enough to drive state-of-the-art 10-bit to 16-bit converters at high frequencies. The AD8138's high bandwidth and IP3 also make it appropriate for use as a gain block in IF and baseband signal chains. The AD8138 offset and dynamic performance make it well suited for a wide variety of signal processing and data acquisition applications.

The AD8138 is available in both SOIC and MSOP packages for operation over -40°C to +85°C temperatures.

RESOURCES & TOOLS

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  • Easy to use, single-ended-to-differential conversion
  • Adjustable output common-mode voltage
  • Externally adjustable gain
  • Low harmonic distortion
    -94 dBc SFDR @ 5 MHz
    -85 dBc SFDR @ 20 MHz
  • -3 dB bandwidth of 320 MHz, G = +1
  • Fast settling to 0.01% of 16 ns
  • Slew rate 1150 V/µs
  • Fast overdrive recovery of 4 ns
  • Low input voltage noise of 5 nV/√Hz
  • 1 mV typical offset voltage
  • Wide supply range +3 V to ±5 V
  • Low power 90 mW on 5 V
  • -3 dB BW (MHz): 320MHz
  • Minimum Gain (Acl): 1
  • Supply Current : 20mA
  • Slew Rate (V/us): 1500V/µs
  • Distortion (2nd) (dBc): -94dBc
  • Distortion (3rd) (dBc): -114dBc
  • Package: 8-Lead CSP,8-Lead SOIC

Pin Configuration Diagram for AD8138

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Similar Products

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Part# -3 dB BW (MHz) Minimum Gain (Acl) Voltage Supply (V) Supply Current Slew Rate (V/us) Distortion (2nd) (dBc) Distortion (3rd) (dBc) Package Price* (1000-4999)
AD6630 700 - +/- 5 30mA 3700 - - 16-Lead SOIC $4.18
AD8132 350 1 +/- 5 10.7mA 1200 -97 -100 8-Lead MSOP, 8-Lead SOIC $1.67
AD8137 110 1 +/- 6 3.6mA 450 -85 -85 8-Lead SOIC $1.10
AD8138 320 1 +/- 5 20mA 1500 -94 -114 8-Lead CSP, 8-Lead SOIC $3.75
AD8139 410 1 5 to 12 24.5mA 800 -90 -105 8-Lead CSP, 8-Lead SOIC $3.75
AD8350 900 - 4 to 11 28mA 2000 -66 -65 8-Lead SOIC/8-Lead uSOIC $2.52
AD8351 2200 1 3 to 5.5 28mA 13000 -79 -81 10-Lead uSOIC $2.68
AD8352 2200 - 3 to 5.5 37mA 11000 -83 -83 16-Lead LFCSP $3.53
ADA4922-1 38 1 +/- 12 9.4mA 730 -116 -109 - $3.63
ADA4927-1 2300 1 4.5 to 11 22.1mA 5000 -87 -89 16-Lead LFCSP $3.79
ADA4927-2 2300 1 4.5 to 11 22.1mA 5000 -87 -89 24-Lead LFCSP $6.29
ADA4932-1 560 1 3 to 11 9.6mA 410 -72 -80 16-Lead LFCSP $2.95
ADA4932-2 560 1 3 to 11 9.6mA 410 -72 -80 24-Lead LFCSP $5.29
ADA4937-1 1900 1 3 to 5.25 39.5mA 6000 -70 -84 16-Lead LFCSP $3.79
ADA4937-2 1900 1 3 to 5.25 42mA 6000 -77 -84 16-Lead LFCSP, 24-Lead LFCSP $5.69
ADA4938-1 1000 1 4.5 to 11 40mA 4700 -82 -82 16-Lead LFCSP, 24-Lead LFCSP $3.79
ADA4938-2 1000 1 4.5 to 11 36.5mA 4700 -82 -82 16-Lead LFCSP, 24-Lead LFCSP $5.69
ADA4939-1 1400 2 3 to 5 37.7mA 6800 -77 -95 16-Lead LFCSP $3.79
ADA4939-2 1400 2 3 to 5 37.7mA 6800 -77 -91 16-Lead LFCSP $5.69
ADA4941-1 30 2 - 2.3mA 22 -75 -71 8-Lead LFCSP, 8-Lead SOIC $2.42
ADA4950-1 750 1 3 to 11 9.5mA 2900 -80 -84 16-Lead LFCSP, 24-Lead LFCSP $2.99
ADA4950-2 750 1 3 to 11 9.5mA 2900 -80 -84 16-Lead LFCSP, 24-Lead LFCSP $5.29
ADL5561 2900 6 3.3 40mA 9800 -95 -87 16-Lead LFCSP $3.68
ADL5562 3300 6 3.3 80mA 9800 -104 -87 16-Lead LFCSP $3.68
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*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.