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Balanced Mod/Dmod 20-Pin PDIP

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AD630KN General Description

The AD630 is a high precision balanced modulator/demodulatorthat combines a flexible commutating architecture with theaccuracy and temperature stability afforded by laser wafer trimmedthin film resistors. A network of on-board applications resistorsprovides precision closed-loop gains of ±1 and ±2 with 0.05%accuracy (AD630B). These resistors may also be used to accuratelyconfigure multiplexer gains of 1, 2, 3, or 4. External feedbackenables high gain or complex switched feedback topologies.

The AD630 can be thought of as a precision op amp with twoindependent differential input stages and a precision comparatorthat is used to select the active front end. The rapid responsetime of this comparator coupled with the high slew rate and fastsettling of the linear amplifiers minimize switching distortion.

The AD630 is used in precision signal processing and instrumentationapplications that require wide dynamic range. Whenused as a synchronous demodulator in a lock-in amplifierconfiguration, the AD630 can recover a small signal from100 dB of interfering noise (see the Lock-In AmplifierApplications section). Although optimized for operation up to1 kHz, the circuit is useful at frequencies up to several hundredkilohertz.

Other features of the AD630 include pin programmable frequencycompensation; optional input bias current compensationresistors, common-mode and differential-offset voltage adjustment,and a channel status output that indicates which of thetwo differential inputs is active.

Product Highlights

  • The application flexibility of the AD630 makes it the bestchoice for applications that require precisely fixed gain,switched gain, multiplexing, integrating-switchingfunctions, and high speed precision amplification.
  • The 100 dB dynamic range of the AD630 exceeds that ofany hybrid or IC balanced modulator/demodulator and iscomparable to that of costly signal processing instruments.
  • The op amp format of the AD630 ensures easy implementationof high gain or complex switched feedbackfunctions. The application resistors facilitate the implementationof most common applications with no additional parts.
  • The AD630 can be used as a 2-channel multiplexer with gainsof 1, 2, 3, or 4. The channel separation of 100 dB at 10 kHzapproaches the limit achievable with an empty IC package.
  • Laser trimming of the comparator and amplifying channeloffsets eliminate the need for external nulling in most cases.
  • Analog Devices, Inc Inventory

    Key Features

    • Recovers signal from 100 dB noise
    • 2 MHz channel bandwidth
    • 45 V/µs slew rate
    • Low crosstalk: −120 dB at 1 kHz, −100 dB at 10 kHz
    • Pin programmable, closed-loop gains of ±1 and ±2
    • 0.05% closed-loop gain accuracy and match
    • 100 µV channel offset voltage (AD630)
    • 350 kHz full power bandwidth
    • Chips available
    Analog Devices, Inc Original Stock


    • Balanced modulation and demodulation
    • Synchronous detection
    • Phase detection
    • Quadrature detection
    • Phase sensitive detection
    • Lock in amplification
    • Square wave multiplication
    Analog Devices, Inc Inventory


    place Philippines launch_date Oct 31, 1995
    last_inspection_date +90 rohs_version 2011/65/EU, 2015/863
    supplier_cage_code 24355 htsusa 8542390001
    schedule_b 8542390000 ppap False
    aec False

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    Availability: 6932 PCS

    Qty. Unit Price(USD) Ext. Price
    1+ $85.963 $85.96
    198+ $34.301 $6,791.60
    504+ $33.154 $16,709.62
    1008+ $32.588 $32,848.70

    The prices below are for reference only.