Refer to the PDF data sheet for device specific package drawings
The ADS7044 is a 1-MSPS, analog-to-digital converter (ADC). The device supports a wide analog input voltage range (±1.65 V to ±3.6 V) and includes a capacitor-based, successive-approximation register (SAR) ADC with an inherent sample-and-hold circuit. The SPI-compatible serial interface is controlled by the CS and SCLK signals. The input signal is sampled with the CS falling edge and SCLK is used for conversion and serial data output. The device supports a wide digital supply range (1.65 V to 3.6 V), enabling direct interface to a variety of host controllers. The device complies with the JESD8-7A standard for normal DVDD range (1.65 V to 1.95 V).
The device is available in 8-pin, miniature, leaded, and X2QFN packages and is specified for operation from –40°C to 125°C. Miniature form-factor and extremely low-power consumption make this device suitable for space-constrained, battery-powered applications.
PART NAME | PACKAGE | BODY SIZE (NOM) |
---|---|---|
ADS7044 | X2QFN (8) | 1.50 mm × 1.50 mm |
VSSOP (8) | 2.30 mm × 2.00 mm |
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Changes from C Revision (February 2015) to D Revision
Changes from B Revision (December 2014) to C Revision
Changes from A Revision (November 2014) to B Revision
Changes from * Revision (November 2014) to A Revision
PIN | I/O | DESCRIPTION | ||
---|---|---|---|---|
NAME | NO. | |||
RUG | DCU | |||
AINM | 8 | 5 | Analog input | Analog signal input, negative |
AINP | 7 | 6 | Analog input | Analog signal input, positive |
AVDD | 6 | 7 | Supply | Analog power-supply input, also provides the reference voltage to the ADC |
CS | 1 | 4 | Digital input | Chip-select signal, active low |
DVDD | 4 | 1 | Supply | Digital I/O supply voltage |
GND | 5 | 8 | Supply | Ground for power supply, all analog and digital signals are referred to this pin |
SCLK | 3 | 2 | Digital input | Serial clock |
SDO | 2 | 3 | Digital output | Serial data out |
MIN | MAX | UNIT | |
---|---|---|---|
AVDD to GND | –0.3 | 3.9 | V |
DVDD to GND | –0.3 | 3.9 | V |
AINP to GND | –0.3 | AVDD + 0.3 | V |
AINM to GND | –0.3 | AVDD + 0.3 | V |
Digital input voltage to GND | –0.3 | DVDD + 0.3 | V |
Storage temperature, Tstg | –60 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±2000 | V |
Charged device model (CDM), per JEDEC specification JESD22-C101(2) | ±1000 |
MIN | MAX | UNIT | ||
---|---|---|---|---|
AVDD | Analog supply voltage range | 1.65 | 3.6 | V |
DVDD | Digital supply voltage range | 1.65 | 3.6 | V |
TA | Operating free-air temperature | –40 | 125 | °C |
THERMAL METRIC(1) | ADS7044 | UNIT | ||
---|---|---|---|---|
RUG (X2QFN) | DCU (VSSOP) | |||
8 PINS | 8 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 177.5 | 235.8 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 51.5 | 79.8 | °C/W |
RθJB | Junction-to-board thermal resistance | 76.7 | 117.6 | °C/W |
ψJT | Junction-to-top characterization parameter | 1.0 | 8.9 | °C/W |
ψJB | Junction-to-board characterization parameter | 76.7 | 116.5 | °C/W |
RθJC(bot) | Junction-to-case (bottom) thermal resistance | N/A | N/A | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|---|---|
ANALOG INPUT | |||||||
Full-scale input voltage span(1) | –AVDD | AVDD | V | ||||
Absolute input voltage range | AINP to GND | –0.1 | AVDD + 0.1 | V | |||
AINM to GND | –0.1 | AVDD + 0.1 | |||||
CS | Sampling capacitance | 15 | pF | ||||
SYSTEM PERFORMANCE | |||||||
Resolution | 12 | Bits | |||||
NMC | No missing codes | 12 | Bits | ||||
INL | Integral nonlinearity | AVDD = 3 V | –1 | ±0.7 | 1 | LSB(2) | |
AVDD = 1.8 V | –2 | ±1 | 2 | ||||
DNL | Differential nonlinearity | AVDD = 3 V | –0.99 | ±0.5 | 1 | LSB | |
AVDD = 1.8 V | –0.99 | ±0.7 | 2 | ||||
EO | Uncalibrated offset error | AVDD = 1.65 V to 3.6 V | ±12 | LSB | |||
Calibrated offset error(6) | AVDD = 3 V | –3 | ±0.5 | 3 | |||
AVDD = 1.8 V | –4 | ±1 | 4 | ||||
dVOS/dT | Offset error drift with temperature | 5 | ppm/°C | ||||
EG | Gain error | AVDD = 3 V | –0.1 | ±0.05 | 0.1 | %FS | |
AVDD = 1.8 V | –0.2 | ±0.1 | 0.2 | ||||
Gain error drift with temperature | 2 | ppm/°C | |||||
CMRR | Common-mode rejection ratio | fIN = 2 kHz, AVDD = 3 V | 53 | dB | |||
SAMPLING DYNAMICS | |||||||
tACQ | Acquisition time | 200 | ns | ||||
Maximum throughput rate | 16-MHz SCLK, AVDD = 1.65 V to 3.6 V | 1 | MHz | ||||
DYNAMIC CHARACTERISTICS | |||||||
SNR | Signal-to-noise ratio(4) | fIN = 2 kHz, AVDD = 3 V | 70 | 71 | dB | ||
fIN = 2 kHz, AVDD = 1.8 V | 70 | ||||||
THD | Total harmonic distortion(4)(3) | fIN = 2 kHz, AVDD = 3 V | –85 | dB | |||
SINAD | Signal-to-noise and distortion(4) | fIN = 2 kHz, AVDD = 3 V | 69.5 | 71 | dB | ||
fIN = 2 kHz, AVDD = 1.8 V | 70 | ||||||
SFDR | Spurious-free dynamic range(4) | fIN = 2 kHz, AVDD = 3 V | 85 | dB | |||
BW(fp) | Full-power bandwidth | At –3 dB, AVDD = 3 V | 25 | MHz | |||
DIGITAL INPUT/OUTPUT (CMOS Logic Family) | |||||||
VIH | High-level input voltage(5) | 0.65 DVDD | DVDD + 0.3 | V | |||
VIL | Low-level input voltage(5) | –0.3 | 0.35 DVDD | V | |||
VOH | High-level output voltage(5) | At Isource = 500 µA | 0.8 DVDD | DVDD | V | ||
At Isource = 2 mA | DVDD – 0.45 | DVDD | |||||
VOL | Low-level output voltage(5) | At Isink = 500 µA | 0 | 0.2 DVDD | V | ||
At Isink = 2 mA | 0 | 0.45 | |||||
POWER-SUPPLY REQUIREMENTS | |||||||
AVDD | Analog supply voltage | 1.65 | 3 | 3.6 | V | ||
DVDD | Digital I/O supply voltage | 1.65 | 3 | 3.6 | V | ||
IAVDD | Analog supply current | At 1 MSPS with AVDD = 3 V | 300 | µA | |||
At 100 kSPS with AVDD = 3 V | 30 | ||||||
At 1 MSPS with AVDD = 1.8 V | 145 | ||||||
PD | Power dissipation | At 1 MSPS with AVDD = 3 V | 900 | µW | |||
At 100 kSPS with AVDD = 3 V | 90 | ||||||
At 1 MSPS with AVDD = 1.8 V | 261 |
SNR = 72.58 dB | THD = –93 dB | fIN = 2 kHz |
Number of samples = 32768 |
fIN = 2 kHz |
AVDD = 3 V |
AVDD = 1.8 V |
AVDD = 1.8 V |
SNR = 71.95 dB | THD = –76.5 dB | fIN = 250 kHz |
Number of samples = 32768 |
Mean code = 2046.98 | Sigma = 0.14 |
AVDD = 3 V |
AVDD = 1.8 V |
AVDD = 3 V |
The device complies with the JESD8-7A standard for DVDD from 1.65 V to 1.95 V. Figure 31 shows voltage levels for the digital input and output pins.