TSA7887 datasheet(3/20 Pages) TOUCHSTONE

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TSA7887

TSA7887DS r1p0

Page 3

RTFDS

ELECTRICAL CHARACTERISTICS

VDD = +2.7V to +5.25V; VREF = 2.5V External/Internal Reference unless otherwise noted; fSCLK = 2 MHz;

TA = TMIN to TMAX, unless otherwise noted.

Parameter

A Version

B Version

Unit

Test Conditions/Comments

DYNAMIC PERFORMANCE

Signal to Noise + Distortion Ratio (SNR)

dB (typ)

fIN = 10 kHz sine wave, fSAMPLE = 125 ksps

Total Harmonic Distortion (THD)

−80

dB (typ)

fIN = 10 kHz sine wave, fSAMPLE = 125 ksps

Peak Harmonic or Spurious Noise

–80

−80

db (typ)

fIN = 10 kHz sine wave, fSAMPLE = 125 ksps

Intermodulation Distortion (IMD)

Second-Order Terms

−80

dB (typ)

f1 = 9.983 kHz, f2 = 10.05 kHz, fSAMPLE = 125 ksps

Third-Order Terms

−80

dB (typ)

f1 = 9.983 kHz, f2 = 10.05 kHz, fSAMPLE = 125 ksps

Channel-to-Channel Isolation

−80

dB (typ)

fIN = 25 kHz

Full-Power Bandwidth

2.5

MHz (typ)

Measured at 3 dB down

DC ACCURACY(Any channel)

Resolution

Bits

Integral Nonlinearity

±2

±1

LSB (max)

Differential Nonlinearity

±2

±1

LSB (max)

Guaranteed no missing codes to 11 bits (A Grade)

Offset Error

±3

LSB (max)

VDD = 5V, dual-channel mode

±4

LSB (max)

VDD = 3V, dual-channel mode

±6

LSB (typ)

Single-channel mode

Offset Error Match

0.5

LSB (max)

Gain Error

±2

LSB (typ)

Dual-channel mode

±1

LSB (max)

Single-channel mode, external reference

±6

LSB (typ)

Single-channel mode, internal reference

Gain Error Match

LSB (max)

ANALOG INPUT

Input Voltage Ranges

0 to VREF

Leakage Current

±5

μA (max)

Input Capacitance

pF (typ)

REFERENCE INPUT/OUTPUT

REFIN Input Voltage Range

2.5/VDD

V (min/max)

Functional from 1.2V

Input Impedance

kΩ (typ)

Very high impedance if internal reference disabled

REFOUT Output Voltage

2.45/2.55

V (min/max)

REFOUT Temperature Coefficient

±50

ppm/°C (typ)

LOGIC INPUTS

Input High Voltage, VINH

2.4

V (min)

VDD = 4.75V to 5.25V

2.1

V (min)

VDD = 2.7V to 3.6V

Input Low Voltage, VINL

0.8

V (max)

VDD = 2.7 V to 5.25 V

Input Current, IIN

±1

μA (max)

Typically 10 nA, VIN = 0 V or VDD

Input Capacitance, CIN

pF (max)

LOGIC OUTPUTS

Output High Voltage, VOH

ISOURCE = 200 μA

VDD − 0.5

V (min)

VDD = 2.7V to 5.25V

Output Low Voltage, VOL

0.4

V (max)

ISINK = 200 μA

Floating-State Leakage Current

±1

μA (max)

Floating-State Output Capacitance

pF (max)

Output Coding

Straight (Natural) Binary

CONVERSION RATE

Throughput Time

SCLK cycles

Conversion time plus acquisition time is 125 ksps,

with 2 MHz Clock

Track-and-Hold Acquisition Time

1.5

SCLK cycles

Conversion Time

14.5

SCLK cycles

7.25 μs (2 MHz Clock)

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