AMC7891

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SBAS518A

– AUGUST 2011 – REVISED DECEMBER 2011

ELECTRICAL CHARACTERISTICS

– (ADC SPECIFICATIONS)

AVDD = 4.75 to 5.5 V, GPIOVDD = 1.8 to 5.5 V, SPIVDD = 1.8 to 5.5 V, AGND = DGND = 0 V, External ADC reference = AVDD,

TA = –40°C to 105°C (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

DC ACCURACY

Resolution

10

Bits

INL

Integral nonlinearity

±0.1

±1

LSB

DNL

Differential nonlinearity

Specified monotonic

±0.1

±1

LSB

Offset error

±0.5

±2

LSB

Offset error match

±0.4

LSB

Gain error

±0.5

±2

LSB

Gain error match

±0.4

LSB

CONVERSION TIME

ADC conversion rate

500

kSPS

Autocycle update rate

All 8 ADC input channels enabled

16

µs

Throughput rate

SCLK

≥ 12 MHz, single analog channel

500

kSPS

Conversion delay

Delay from trigger to conversion start

2

4

µs

ANALOG INPUT

Absolute input voltage range

Independent of gain setting

AGND

– 0.2

AVDD + 0.2

V

Gain = 1, adcn_gain =

'0'

0

VREF

V

Full scale input voltage range

Gain = 2, adcn_gain =

'1'

0

2

× VREF

V

Input capacitance(1)

40

pF

DC input leakage current

Measured with ADC in Hold mode

±1

µA

AC PERFORMANCE

SFDR

Spurious Free Dynamic Range

fIN = 1 kHz, –1 dBFS sine wave

76

dBc

SNR

Signal to Noise Ratio

fIN = 1 kHz, –1 dBFS sine wave

61

dBc

SINAD

Signal to Noise+Distortion Ratio

fIN = 1 kHz, –1 dBFS sine wave

60.5

dBc

fIN = 1 kHz, –1 dBFS sine wave, Measured

THD

Total Harmonic Distortion

75

dBc

up to the fifth harmonic

INTERNAL ADC REFERENCE (2)

Internal ADC reference buffered output at

VREF

Reference output voltage

2.5

V

REF pin

Reference buffer power

AVDD = 5 V

360

µA

Reference temperature coefficient

10

ppm/

°C

EXTERNAL ADC REFERENCE

VREF

Reference input voltage

External ADC reference input to REF pin

0.3

AVDD

V

Input resistance(1)

VREF = 5 V, AIN = 5 V

20

k

Ω

TEMPERATURE SENSOR

Operating range

–40

125

°C

Accuracy

TA = –40°C to 125°C, AVDD = 5 V

±1

±2.5

°C

Resolution

LSB size

0.125

°C

Conversion time

15

ms

(1)

Specified by design. Not tested during production.

(2)

Use an external buffer amplifier with high impedance input to drive any external load.

Copyright

© 2011, Texas Instruments Incorporated

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