ADS7808

3

SBAS018A

www.ti.com

ADS7808U

ADS7808UB

PARAMETER

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

Serial 12 bits

Binary Two's Complement or Straight Binary

Conversion results only available after completed conversion.

Selectable for internal or external data clock

SAMPLING DYNAMICS

Aperture Delay

40

✻

ns

Aperture Jitter

Sufficient to meet AC specs

✻

ns

Transient Response

FS Step

2

✻

µs

150

✻

ns

REFERENCE

Internal Reference Voltage

No Load

2.48

2.5

2.52

✻✻

✻

V

Internal Reference Source Current

1

✻

µA

(Must use external buffer)

External Reference Voltage Range

2.3

2.5

2.7

✻✻

✻

V

for Specified Linearity

External Reference Current Drain

Ext. 2.5000V Ref

100

✻

µA

DIGITAL INPUTS

Logic Levels

–0.3

+0.8

✻✻

V

+2.0

✻✻

V

±10

✻

µA

±10

✻

µA

DIGITAL OUTPUTS

Data Format

Data Coding

Pipeline Delay

Data Clock

Internal

EXT/INT LOW

2.3

✻

MHz

(Output Only When

Transmitting Data)

External

EXT/INT HIGH

0.1

10

✻✻

MHz

(Can Run Continually)

+0.4

✻

V

✻

V

Leakage Current

High-Z State,

±5

✻

µA

Output Capacitance

High-Z State

15

15

pF

POWER SUPPLIES

Specified Performance

Must be

≤ V

ANA

+4.75

+5

+5.25

✻✻

✻

V

+4.75

+5

+5.25

✻✻

✻

V

0.3

✻

mA

16

✻

mA

Power Dissipation: PWRD LOW

100

✻

mW

PWRD HIGH

50

✻

µW

TEMPERATURE RANGE

Specified Performance

–40

+85

✻✻

°C

Derated Performance

–55

+125

✻✻

°C

Storage

–65

+150

✻✻

°C

Thermal Resistance (

θ

SO

75

✻

°CW

✻ Specifications same as ADS7808U.

NOTES: (1) LSB means Least Significant Bit. For the

±10V input range, one LSB is 4.88mV. (2) Typical rms noise at worst case transitions and temperatures.

(3) As measured with fixed resistors in Figure 4. Adjustable to zero with external potentiometer. (4) For bipolar input ranges, 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. For unipolar input ranges, full scale error is the deviation of the last code transition divided by the transition voltage. It also includes

the effect of offset error. (5) All specifications in dB are referred to a full-scale

±10V input. (6) Full-Power Bandwidth defined as Full-Scale input frequency at which

signal is 3V.