THS4508 Wideband Fully Differential Amplifier | TI.com

THS4508
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Wideband Fully Differential Amplifier

 

Description

The THS4508 is a wideband, fully-differential operational amplifier designed for single-supply 5-V data acquisition systems. It has very low noise at 2.3 nV/√Hz, and extremely low harmonic distortion of -72 dBc HD2 and -79 dBc HD3 at 100 MHz with 2 VPP, G = 10 dB, and 1-Ω load. Slew rate is very high at 6400 Vµs, and with settling time of 2 ns to 1% (2 V step), it is ideal for pulsed applications. It is designed for minimum gain of 6 dB, but is optimized for gain of 10 dB.

To allow for dc coupling to analog-to-digital converters (ADCs), its unique output common-mode control circuit maintains the output common-mode voltage within 5-mV offset (typical) from the set voltage, when set within 0.5 V of mid-supply. The common-mode set point is set to mid-supply by internal circuitry, which may be over-driven from an external source.

The THS4508 is a high-performance amplifier that has been optimized for use in high performance, 5-V single-supply data acquisition systems. The output has been optimized for best performance with its common-mode voltages set to mid-supply, and the input has been optimized for best performance with its common-mode voltage set to 0.7 V. High performance at a low power-supply voltage is ideal for high-performance, single-supply 5-V data-acquisition systems with a minimum parts count. The combined performance of the THS4508 in a gain of 10-dB driving the ADS5500 ADC, sampling at 125 MSPS, is 82-dBc SFDR, and 68.3-dBc SNR with a -1-dBFS signal at 70 MHz.

The THS4508 is offered in a quad 16-pin leadless QFN package (RGT), and is characterized for operation over the full industrial temperature range from -40°C to +85°C.

Features

  • Fully Differential Architecture
  • Common-Mode Input Range Includes the
    Negative Rail
  • Minimum Gain of 2 V/V (6 dB)
  • Bandwidth: 2 GHz
  • Slew Rate: 6400 V/µs
  • 1% Settling Time: 2 ns
  • HD2: -72 dBc at 100 MHz
  • HD3: -79 dBc at 100 MHz
  • OIP2: 78 dBm at 70 MHz
  • OIP3: 42 dBm at 70 MHz
  • Input Voltage Noise: 2.3 nV/√Hz (f > 10 MHz)
  • Noise Figure: 19.2 dB (G = 10 dB)
  • Output Common-Mode Control
  • 5-V Power Supply Current: 39.2 mA
  • Power-Down Capability: 0.65 mA
  • APPLICATIONS
    • 5-V Data-Acquisition Systems
    • High Linearity ADC Amplifier
    • Wireless Communication
    • Medical Imaging
    • Test and Measurement

Parametrics

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Part number Order 2nd harmonic (dBc) 3rd harmonic (dBc) @ MHz Acl, min spec gain (V/V) Approx. price (US$) Architecture BW @ Acl (MHz) Device type Features GBW (Typ) (MHz) Number of channels (#) Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Slew rate (Typ) (V/us) Total supply voltage (Min) (+5V=5, +/-5V=10) Total supply voltage (Max) (+5V=5, +/-5V=10) Vn at flatband (Typ) (nV/rtHz) Vn at 1 kHz (Typ) (nV/rtHz) Vos (offset voltage @ 25 C) (Max) (mV)
THS4508 Order now 104     105     10     2     5.18 | 1ku     Fully Differential ADC Driver     2000     RF FDA     Shutdown
Decompensated    
3000     1     -40 to 85     VQFN | 16     16VQFN: 9 mm2: 3 x 3 (VQFN | 16)     6400     3.75     5.25     2.3     2.3     4    
THS4509 Order now 104     108     10     2     3.50 | 1ku     Fully Differential ADC Driver     2000     RF FDA     Shutdown
Decompensated    
3000     1     -40 to 85     VQFN | 16     16VQFN: 9 mm2: 3 x 3 (VQFN | 16)     6600     3     5.25     1.9     10     4    
THS4511 Samples not available 117     106     10     1     5.45 | 1ku     Fully Differential ADC Driver     1600     RF FDA     Shutdown     2000     1     -40 to 85     VQFN | 16     16VQFN: 9 mm2: 3 x 3 (VQFN | 16)     4900     3.75     5.25     2     20     4    
THS4513 Order now 110     108     10     1     4.47 | 1ku     Fully Differential ADC Driver     1600     RF FDA     Shutdown     2800     1     -40 to 85     VQFN | 16     16VQFN: 9 mm2: 3 x 3 (VQFN | 16)