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  1. AN-0974: Multicarrier TD-SCMA Feasibility
    Application Note
    The goal of this application note is to demonstrate the feasibility of implementing a multicarrier TD-SCDMA transceiver and describe what the major subsystem performances must be.

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    1. AD7988-1, differential input, common mode rejection on VCOM

      Forum Thread
      Answered
      Differential Amplifiers and ADC Drivers
      25 July, 2024
      … based on SD) IN- connect to VCOM (2.5V) IN+ connect to signal (OP2177 op-amp output) of +/-1.5Vpp (1V to 4V) I connect AD7988-1: VREF = 4.096 (ADR364), VDD = 2.5V (ADR361) and VIO = 3V3 for SPI bus, sampling at 1KSPS on SPI bus. The AD7988-1 …
      Single Channel A/D Convertersadcinputad7988driveMultiplexed A/D Convertersad7732impedancePrecision A/D Converterssar

    2. AD7988, in daisy chain mode, the SDO will not tristate when CNV goes LOW, correct?AD7988, in daisy chain mode, the SDO will not tristate when CNV goes LOW, correct?

      Forum Thread
      Answered
      Precision ADCs
      13 October, 2017
      AAD7988, in daisy chain mode, the SDO will not tristate when CNV goes LOW, correct? So I have to isolate the SDO line from other devices (ie AD7124) to avoid conflicts? R.
      ad7988

    3. AD7988 digital output status when VREF/VDD powered down

      Forum Thread
      Answered
      Precision ADCs
      27 September, 2017
      Good morning! I am using two AD7988-5 parts in a chain mode as seen in datasheet figure 38. VREF and VDD (pins 1 and 2) are connected to a 2.5V source that is turned on when data collections are required otherwise it is 0V (low duty cycle every …
      Single Channel A/D Convertersad7988ad7988-5Precision A/D Converters

    4. AD7988-5・SDO high impedance period

      Forum Thread
      Answered
      Precision ADCs
      30 August, 2018
      Hello, Is the time during which the SDO of AD7988-5 is in high impedance specified?Is it equal to tCNVH? or tCONV? or tCNVH+tEN? Regards,
      Single Channel A/D Convertersad7988-5Precision A/D Converters

    5. AD7988-1 don't answer

      Forum Thread
      Answered
      Precision ADCs
      06 December, 2016
      Hello. I designed circuit based on AD-7988-1. The circuit repeates the reference design for the CS-mode (SDI pullup).After circuit has been assembled, I checked the power supply and the reference voltage to the output circuit - everything is fine: VDD=2v5, VIO=3v3, VREF=5v0At the In …
      Single Channel A/D ConvertersPrecision A/D Convertersad7988-1

    6. AD7988 ADC evaluation. Exact Sampling Frequency.

      Forum Thread
      Answered
      Precision ADCs
      10 October, 2016
      We are testing the AD7988 analog converter using the EVAL-AD7988-5SDZ and the EVAL-SDP-CB1Z. We would like to acquire 25600 sps, but when we use the visual aplication to manage the EVAL-SDP-CB1Z the "Samplin Frequency" is changed to 25565 sps (very close but not exactly …
      ad7988 adc evaluation. exact sampling frequency.

    7. About AD7988 VREF current consumption

      Forum Thread
      Answered
      Precision ADCs
      09 August, 2016
      Hi, All. AD7988 data sheet to the Reference Load Current (VREF = 5V) has been described as 250uA (Typ). The power dissipation has been described as REF Only 34uA (170uW / 5V), does not match with the above. I would like to know the current necessary to the VREF pin, which is …
      Single Channel A/D Convertersad7982Precision A/D Converters

    8. AD7988 daisy chain

      Forum Thread
      Answered
      Precision ADCs
      05 April, 2016
      Hi, I design a circuit in which SPI host reads 6 AD7988 devices arranged in daisy chain mode. is there any timing limit for this number of devices? What is the delay of data between SDI and SDO? I can't find it in datasheet. thanks

    9. AD7988 SDO Voltage Level

      Forum Thread
      Answered
      Precision ADCs
      04 February, 2016
      I develop an application where I use a AD7988-5 with an interface to the processor with 5V signals. Ref=5V VDD=2.5V VIO=5V (For the 5V interface) But now I measure: that the SDO high level is only at 2.5V. In the Datasheet is written: DIGITAL …
      Single Channel A/D Convertersad7988-5Precision A/D Converters

    10. SHARC 2147x. Simultaneously Sampling 6 xx AD7988-5 via 6xx SPORT Interfaces

      Forum Thread
      Answered
      SHARC Processors
      27 November, 2015
      … a Clock) be shared by 6xx SPORT Ports? The Frame Sync would generate the CNV pulse that would simultaneously trigger the Converts for the 6xx AD7988-5. Can you point me to an app note that details interfacing a SPORT Interface to a serial ADC similar to the AD7988-5 …
      Single Channel A/D Convertersad7988-5Precision A/D Converters