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AD7878AQ
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Product Detailed Parameters
- Description：IC ADC 12BIT W/DSP INT 28-CDIP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Bulk
- Number of Bits：12
- Sampling Rate (Per Second)：100k
- Number of Inputs：-
- Input Type：-
- Data Interface：SPI, DSP
- Configuration：-
- Ratio - S/H:ADC：-
- Number of A/D Converters：1
- Architecture：-
- Reference Type：-
- Voltage - Supply, Analog：-
- Voltage - Supply, Digital：-
- Features：-
- Operating Temperature：-25°C ~ 85°C
- Package / Case：28-CDIP (0.600", 15.24mm)
- Supplier Device Package：28-CDIP
- Mounting Type：Through Hole
- Grade：-
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Overview
The AD7878AQ is a complete 12-bit analog-to-digital converter featuring an integrated DSP interface. It operates within a temperature range of -25°C to +85°C and delivers a minimum signal-to-noise ratio of 70 dB at a 10 kHz input frequency with a 100 kHz sampling rate. The device incorporates an 8-word FIFO memory, a track/hold amplifier with 2 μs acquisition time, and a 3 V zener reference. Data access time is specified at 57 ns maximum. Power consumption is typically 60 mW under standard operating conditions.
Feature Summary
- Integrated DSP interface with 8-word FIFO memory for reduced software overhead
- On-chip track/hold amplifier and 3 V reference for complete ADC functionality
- Fast data access time compatible with high-speed microprocessors
- Status/control register for monitoring FIFO status and configuring outputs
Applications
- Digital Signal Processing
- Speech Recognition and Synthesis
- Spectrum Analysis
- High Speed Modems
- DSP Servo Control
Procurement Notes
Verify the specific grade suffix AQ corresponds to the required -25°C to +85°C operating temperature range and Q-28 package option. Confirm that the 70 dB SNR specification meets system requirements, as higher performance grades like BQ offer 72 dB. Ensure power supply rails are stable within ±5% tolerance for specified performance.
Selection Notes
Select the AD7878AQ when a 12-bit resolution with integrated FIFO is needed for DSP applications. Choose this model over JN or KN variants if operation below 0°C is required. Consider the BQ variant if a 72 dB SNR is necessary instead of the 70 dB provided by the AQ grade. Verify compatibility with target processor interfaces such as ADSP-2100 or TMS320 series.
Part Context
The AD7878 belongs to Analog Devices' LC2MOS family of complete ADCs designed for direct interfacing with digital signal processors. It combines precision bipolar circuits with low-power CMOS logic. The AQ grade specifically denotes the commercial extended temperature version packaged in a hermetic ceramic dual-in-line (Cerdip) format, distinct from plastic DIP or leadless ceramic options.
Replacement Considerations
Public confirmed substitutes include AD7878BQ for higher SNR performance in the same package and temperature range, and AD7878JN for lower cost applications within the 0°C to +70°C range. Direct pin-compatible replacements within the same family should be verified against specific dynamic parameter requirements.
