ADS7811

3

SBOS041A

www.ti.com

RESOLUTION

16

Bits

ANALOG INPUT

Voltage Range

±2.5V

V

Impedance

After Input Capacitor is Charged

100

M

Ω

Capacitance

30

pF

THROUGHPUT SPEED

Conversion Cycle

Acquire and Convert

4.0

µs

Throughput Rate

250

kHz

DC ACCURACY

Integral Linearity Error

±6

No Missing Codes

15

Bits

0.8

LSB

±0.5

%

Full-Scale Error Drift

±7

ppm/

°C

External 2.5000V Reference

±0.2

%

Full-Scale Error Drift

External 2.5000V Reference

2

ppm/

°C

Bipolar Zero Error

±10

mV

Bipolar Zero Error Drift

±2

ppm/

°C

Power-Supply Sensitivity

±6

±16

LSB

AC ACCURACY

Spurious-Free Dynamic Range

96

100

Total Harmonic Distortion

–98

–94

dB

Signal-to-(Noise+Distortion)

82

87

dB

–60dB Input

28

dB

Signal-to-Noise

82

87

dB

1MHz

Aperture Delay

40

ns

REFERENCE

Internal Reference Voltage

2.48

2.5

2.52

V

Internal Reference Source Current

1

µA

Internal Reference Drift

15

ppm/

°C

External Reference Voltage Range

2.5

V

External Reference Current Drain

100

µA

DIGITAL INPUTS

Logic Levels

–0.3

+0.8

V

+2.8

V

±10

µA

±10

µA

DIGITAL OUTPUTS

Data Format

Data Coding

+0.4

V

V

Leakage Current

High-Z State,

±5

µA

Output Capacitance

High-Z State

15

pF

DIGITAL TIMING

Bus Access Time

83

ns

Bus Relinquish Time

83

ns

POWER SUPPLIES

+4.75

+5

+5.25

V

–5.25

–5

–4.75

V

+30

mA

–10

mA

Power Dissipation

200

250

mW

TEMPERATURE RANGE

Specified Performance

–25

+85

°C

Storage

–55

+125

°C

NOTES: (1) LSB means Least Significant Bit. For the 16-bit,

±2.5V input ADS7811, one LSB is 76µV.

(2) Typical rms noise at worst case transitions and temperatures.

(3) Full-scale error is the worst case of –Full-Scale or +Full-Scale untrimmed deviation from ideal first and last code transitions, divided by the

transition voltage (not divided by the full-scale range) and includes the effect of offset error.

(4) All specifications in dB are referred to a full-scale

±2.5V input.

(5) Usable Bandwidth defined as Full-Scale input frequency at which Signal-to-(Noise+Distortion) degrades to 60dB, or 10 bits of accuracy.

ELECTRICAL CHARACTERISTICS

ADS7811U

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Parallel 16 bits

Binary Two’s Complement