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AD7938BSU-6
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Product Detailed Parameters
- Description：IC ADC 12BIT 8CHAN 32TQFP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tray
- Number of Bits：12
- Sampling Rate (Per Second)：625k
- Number of Inputs：-
- Input Type：-
- Data Interface：Parallel
- Configuration：-
- Ratio - S/H:ADC：-
- Number of A/D Converters：1
- Architecture：-
- Reference Type：-
- Voltage - Supply, Analog：-
- Voltage - Supply, Digital：-
- Features：-
- Operating Temperature：-40°C ~ 85°C
- Package / Case：32-TQFP
- Supplier Device Package：32-TQFP (7x7)
- Mounting Type：Surface Mount
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Overview
The AD7938BSU-6 is a 12-bit successive approximation register (SAR) analog-to-digital converter featuring eight multiplexed analog input channels and an integrated channel sequencer. It operates on a single 2.7 V to 5.25 V supply with a maximum throughput rate of 625 kSPS. The device includes a low-noise, wide-bandwidth differential track-and-hold amplifier capable of handling input frequencies up to 50 MHz. Power consumption is specified at 3.6 mW maximum at 625 kSPS with a 3 V supply and 7.5 mW maximum with a 5 V supply. It offers software-configurable single-ended, fully differential, or pseudo-differential inputs and features an accurate on-chip 2.5 V reference.
Feature Summary
- Eight analog input channels with a programmable channel sequencer for automated sequential conversion.
- Software-selectable analog input configurations supporting single-ended, fully differential, and pseudo-differential modes.
- Integrated high-precision 2.5 V internal voltage reference with low temperature coefficient.
- VDRIVE function enabling parallel interface logic levels independent of the main analog supply voltage.
Applications
- Portable battery-powered instrumentation requiring low power consumption.
- Industrial process control systems utilizing multi-channel data acquisition.
- Medical equipment such as portable patient monitors and diagnostic devices.
- Chemical analysis solutions including portable and benchtop analyzers.
Procurement Notes
Verify the specific package variant required, as the AD7938-6 series is available in both 32-lead LFCSP and TQFP packages. Confirm that the ordering suffix matches the desired physical footprint and pin configuration. Ensure compatibility with the target system's voltage levels and clocking requirements before finalizing procurement.
Selection Notes
Select this component when a balance of moderate speed and low power is required for multi-channel applications. The built-in sequencer reduces microprocessor overhead by automating channel switching. Consider the VDRIVE feature if interfacing with processors operating at different logic voltages than the ADC supply. Verify that the 625 kSPS throughput meets the system bandwidth requirements.
Part Context
The AD7938BSU-6 belongs to the AD7938-6 family of 12-bit parallel ADCs. It shares architectural similarities with the higher-speed AD7938/AD7939 (1.5 MSPS) but is optimized for lower power operation at reduced speeds. It complements the 4-channel AD7934-6 by providing additional input channels within the same performance class.
Replacement Considerations
The AD7938BSUZ-6 is a parameter-equivalent alternative within the same product line. Designers should verify pinout compatibility and package dimensions when substituting between LFCSP and TQFP variants.
