Features: `2.5 V internal reference: typical drift 3 ppm/°C
Guaranteed max drift 15 ppm/°C
`Throughput: 100 kSPS
`INL: ±2.5 LSB max (±0.0038% of full scale) 16-bit resolution with no missing codes
`S/(N+D): 88 dB min @ 20 kHz
`THD: 96 dB max @ 20 kHz
`Analog input voltage range: 0 V to 2.5 V
`Both AC and DC specifications
`No pipeline delay
`Parallel and serial 5 V/3 V interface
`SPI®/QSPITM/MICROWIRETM/DSP compatible
`Single 5 V supply operation
`Power dissipation
16 mW typ, 160 W @ 1 kSPS without REF
40 mW typ with REF 48-lead LQFP and 48-lead LFCSP packages
`Pin-to-pin compatible with PulSAR ADCsApplication·Data acquisition
·Medical instruments
·Digital signal processing
·Spectrum analysis
·Instrumentation
·Battery-powered systems
·Process controlPinout
SpecificationsParameter Rating
IN2, TEMP2, REF, REFBUFIN, AVDD + 0.3 V to
INGND, REFGND to AGND AGND 0.3 V
Ground Voltage Differences
AGND, DGND, OGND ±0.3 V
Supply Voltages
AVDD, DVDD, OVDD 0.3 V to +7 V
AVDD to DVDD, AVDD to OVDD ±7 V
DVDD to OVDD 0.3 V to +7 V
Digital Inputs 0.3 V to DVDD + 0.3 V
PDREF, PDBUF3 ±20 mA
Internal Power Dissipation4 700 mW
Internal Power Dissipation5 2.5 W
Junction Temperature 150°C
Storage Temperature Range 65°C to +150°C
Lead Temperature Range 300°C
1 Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
2 See Analog Input section.
3 See the Voltage Reference Input section.
4 Specification is for the device in free air:
48-Lead LQFP; JA = 91°C/W, JC = 30°C/W
5 Specification is for the device in free air:
48-Lead LFCSP; JA = 26°C/W.
(Soldering 10 sec)
DescriptionThe AD7661* is a 16-bit, 100 kSPS, charge redistribution SAR analog-to-digital converter that operates from a single 5 V power supply. The part contains a high speed 16-bit sampling ADC, an internal conversion clock, internal reference, error correction circuits, and both serial and parallel system inter-face ports. The AD7661 is hardware factory-calibrated and comprehensively tested to ensure ac parameters such as signal-to-noise ratio (SNR) and total harmonic distortion (THD), in addition to the more traditional dc parameters of gain, offset, and linearity.
The AD7661 is available in a 48-lead LQFP and a tiny 48-lead LFCSP with operation specified from 40°C to +85°C.
AD7661 Data Sheet
