Datasheet AD7661 (Analog Devices)

16-Bit 100 kSPS PulSAR® Unipolar ADC with Reference AD7661 FEATURES FUNCTIONAL BLOCK DIAGRAM 2.5 V internal reference: typical drift 3 ppm/°C REFBUFIN REF REFGND DVDD DGND Guaranteed max drift 15 ppm/°C AGND OVDD Throughput: 100 kSPS AD7661 AVDD SERIAL OGND INL: ±2.5 LSB max (±0.0038% of full scale) REF PORT 16-bit resolution with no missing codes 16 IN SWITCHED DATA[15:0] S/(N+D): 88 dB min @ 20 kHz CAP DAC INGND BUSY THD: –96 dB max @ 20 kHz PARALLEL PDREF INTERFACE RD Analog input voltage range: 0 V to 2.5 V PDBUF CLOCK CS Both AC and DC specifications PD CONTROL LOGIC AND SER/PAR No pipeline delay RESET CALIBRATION CIRCUITRY OB/2C Parallel and serial 5 V/3 V interface
001 0-
BYTESWAP SPI®/QSPITM/MICROWIRETM/DSP compatible
03033-
CNVST Single 5 V supply operation Power dissipation
Figure 1. Functional Block Diagram
16 mW typ, 160 µW @ 1 kSPS without REF Table 1. PulSAR Selection 40 mW typ with REF 800– 48-lead LQFP and 48-lead LFCSP packages Type/kSPS 100–250 500–570 1000 Pin-to-pin compatible with PulSAR ADCs
Pseudo- AD7651 AD7650/AD7652 AD7653 Differential AD7660/AD7661 AD7664/AD7666 AD7667
APPLICATIONS
True Bipolar AD7663 AD7665 AD7671
Data acquisition
True AD7675 AD7676 AD7677
Medical instruments
Differential
Digital signal processing
18-Bit AD7678 AD7679 AD7674
Spectrum analysis
Multichannel/ AD7654
Instrumentation
Simultaneous AD7655
Battery-powered systems Process control PRODUCT HIGHLIGHTS
1. Fast Throughput.
GENERAL DESCRIPTION
The AD7661 is a 100 kSPS, charge redistribution, 16-bit SAR ADC with internal error correction circuitry. The AD7661 is a 16-bit, 100 kSPS, charge redistribution SAR analog-to-digital converter that operates from a single 5 V 2. Superior INL. power supply. The part contains a high speed 16-bit sampling The AD7661 has a maximum integral nonlinearity of ADC, an internal conversion clock, internal reference, error 2.5 LSB with no missing 16-bit codes. correction circuits, and both serial and parallel system inter- 3. Internal Reference. face ports. The AD7661 is hardware factory-calibrated and The AD7661 has an internal reference with a typical comprehensively tested to ensure ac parameters such as signal- temperature drift of 3 ppm/°C. to-noise ratio (SNR) and total harmonic distortion (THD), in 4. Single-Supply Operation. addition to the more traditional dc parameters of gain, offset, The AD7661 operates from a single 5 V supply. Its power and linearity. dissipation decreases with throughput. The AD7661 is available in a 48-lead LQFP and a tiny 48-lead 5. Serial or Parallel Interface. LFCSP with operation specified from –40°C to +85°C. Versatile parallel or 2-wire serial interface arrangement is compatible with both 3 V and 5 V logic.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS DEFINITIONS OF SPECIFICATIONS TYPICAL PERFORMANCE CHARACTERISTICS CIRCUIT INFORMATION CONVERTER OPERATION Transfer Functions TYPICAL CONNECTION DIAGRAM Analog Input Driver Amplifier Choice Voltage Reference Input Power Supply POWER DISSIPATION VERSUS THROUGHPUT CONVERSION CONTROL DIGITAL INTERFACE PARALLEL INTERFACE SERIAL INTERFACE MASTER SERIAL INTERFACE Internal Clock SLAVE SERIAL INTERFACE External Clock External Discontinuous Clock Data Read After Conversion External Clock Data Read During Conversion MICROPROCESSOR INTERFACING SPI Interface (ADSP-219x) APPLICATION HINTS BIPOLAR AND WIDER INPUT RANGES LAYOUT EVALUATING THE AD7661’S PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE