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ADS8507

SLAS381 – DECEMBER 2006

ELECTRICAL CHARACTERISTICS (continued)

At T

unless otherwise specified.

ADS8507I

ADS8507IB

PARAMETER

TEST CONDITIONS

UNIT

MIN

TYP

MAX

MIN

TYP

MAX

DNL

Differential linearity error

-2

3

-1

1.5

LSB

No missing codes

15

16

Bits

0.8

0.8

LSB

Gain Error

±0.2

±0.1

%

-0.5

0.5

-0.25

0.25

%

Full scale error drift

±7

±5

ppm/°C

Ext. 2.5-V Ref

-0.5

0.5

-0.25

0.25

%

Full scale error drift

Ext. 2.5-V Ref

±0.5

±0.5

ppm/°C

±10 V Range

-10

10

-5

5

mV

Bipolar zero error drift

±10 V Range

±0.5

±0.5

ppm/°C

0 V to 5 V, 0 V to 4 V Ranges

-3

3

-3

3

mV

Unipolar zero error drift

0 V to 5 V, 0 V to 4 V Ranges

±0.5

±0.5

ppm/°C

Recovery time to rated accuracy from

2.2-µF Capacitor to CAP

1

1

ms

Power supply sensitivity

±8

±8

LSB

AC ACCURACY

SFDR

Spurious-free dynamic range

90

100

96

102

THD

Total harmonic distortion

-100

-90

-100

-96

dB

83

88

87

89.9

SINAD

Signal-to-(noise+distortion)

dB

-60 dB Input

30

32

SNR

Signal-to-noise

83

88

87

89.9

dB

130

130

kHz

Full-power bandwidth (-3 dB)

600

600

kHz

SAMPLING DYNAMICS

Aperture delay

40

40

ns

Aperture jitter

20

20

ps

Transient response

FS Step

5

5

µs

750

750

ns

REFERENCE

Internal reference voltage

No load

2.48

2.5

2.52

2.48

2.5

2.52

V

Internal reference source current (must

1

1

µA

use external buffer)

Internal reference drift

8

8

ppm/°C

External reference voltage range for

2.3

2.5

2.7

2.3

2.5

2.7

V

specified linearity

External reference current drain

Ext. 2.5-V Ref

100

100

µA

DIGITAL INPUTS

Low-level input voltage

-0.3

+0.8

-0.3

+0.8

V

High-level input voltage

2.0

2.0

V

Low-level input current

±10

±10

µA

(2)

Typical rms noise at worst case transitions.

(3)

As measured with fixed resistors, see Figure 43. Adjustable to zero with external potentiometer.

(4)

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.

(5)

As measured with fixed resistors, see Figure 43. Adjustable to zero with external potentiometer.

(6)

This is the time delay after the ADS8507 is brought out of Power-Down mode until all internal settling occurs and the analog input is

acquired to rated accuracy. A Convert command after this delay will yield accurate results.

(7)

All specifications in dB are referred to a full-scale input.

(8)

Usable bandwidth defined as full-scale input frequency at which Signal-to-(Noise + Distortion) degrades to 60 dB.

(9)

Recovers to specified performance after 2 x FS input overvoltage.

3

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