THS3217 (ACTIVE)

DC to 800-MHz, Differential-to-Single-Ended, DAC Output Amplifier

DC to 800-MHz, Differential-to-Single-Ended, DAC Output Amplifier - THS3217
 

Description

The THS3217 combines the key signal-chain components required to interface with a complementary-current output, digital-to-analog converter (DAC). The flexibility provided by this two-stage amplifier system delivers the low distortion, dc-coupled, differential to single-ended signal processing required by a wide range of systems. The input stage buffers the DAC resistive termination, and converts the signal from differential to single-ended with a fixed gain of 2 V/V. The differential to single-ended output is available externally for direct use, and can also be connected through an RLC filter or attenuator to the input of an internal output power stage (OPS). The wideband, current-feedback, output power stage provides all pins externally for flexible gain setting.

An internal 2×1 multiplexer (mux) to the output power stage noninverting input provides an easy means to select between the internal differential-to-single-ended stage (D2S) output or an external input.

An optional on-chip midsupply buffer provides a wideband, low-output-impedance source for biasing during single-supply operation through the signal-path stages. This feature provides very simple biasing for single-supply, ac-coupled applications operating up to a maximum 15.8-V supply. An external input to this buffer allows for a dc error-correction loop, or a simple output dc offset feature.

A companion device, the THS3215, provides the same functional features at lower quiescent power and bandwidth. The THS3217 and the THS3215 support the emerging high-speed Texas Instruments DACs for AWG applications, such as the DAC38J82.

Features

  • Input Stage: Internal Gain of 2-V/V
    • Buffered Differential Inputs
    • Single-Ended Low Impedance Output
    • Full-Power Bandwidth: 500-MHz (2 VPP)
  • Output Stage: Gain Externally Configurable
    • Full-Power Bandwidth: 500-MHz (5 VPP)
    • Slew Rate: 5000 V/µs
    • SPDT Input Switch / Multiplexer
  • Full Signal Path: Input Stage + Output Stage
    • HD2 (20 MHz, 5 VPP to 100-Ω Load): –60 dBc
    • HD3 (20 MHz, 5 VPP to 100-Ω Load): –75 dBc
    • 10-VPP Output to 100-Ω Load Using Split
      ±6.5-V Supply
    • 12-VPP Output to Heavy Capacitive Loads Using Single 15-V Supply
  • Internal DC Reference Buffer with Low Impedance Output
  • Power-Supply Range:
    • Split Supply: ±4 V to ±7.9 V
    • Single Supply: 8 V to 15.8 V

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Parametrics Compare all products in High-Speed Op Amps (GBW>=50MHz)

 
Architecture
Number of Channels (#)
Total Supply Voltage (Min) (+5V=5, +/-5V=10)
Total Supply Voltage (Max) (+5V=5, +/-5V=10)
BW @ Acl (MHz)
Acl, min spec gain (V/V)
Slew Rate (Typ) (V/us)
Vn at Flatband (Typ) (nV/rtHz)
Vn at 1kHz (Typ) (nV/rtHz)
Iq per channel (Typ) (mA)
Vos (Offset Voltage @ 25C) (Max) (mV)
Rail-to-Rail
Features
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
CMRR (Typ) (dB)
Input Bias Current (Max) (pA)
Offset Drift (Typ) (uV/C)
GBW (Typ) (MHz)
Output Current (Typ) (mA)
2nd Harmonic (dBc)
3rd Harmonic (dBc)
@ MHz
THS3217 THS3215
Bipolar
Current FB   
Bipolar
Current FB   
1    1   
8    8   
15.8    15.8   
800    650   
3    3   
5000    3000   
9    6.6   
40    22   
55    34.5   
18    18   
No    No   
Shutdown    Shutdown   
-40 to 85    -40 to 85   
VQFN    VQFN   
16VQFN: 16 mm2: 4 x 4(VQFN)    16VQFN: 16 mm2: 4 x 4(VQFN)   
55    48   
4000000    4000000   
58    58   
800    650   
120    95   
60    66   
75    68   
20    20