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ELECTRICAL CHARACTERISTICS

ADS8509

SLAS324A – OCTOBER 2004 – REVISED JUNE 2005

At T

Figure 29 and Figure 30) (unless otherwise specified)

ADS8509I

ADS8509IB

PARAMETER

TEST CONDITIONS

UNIT

MIN

TYP

MAX

MIN

TYP

MAX

Resolution

16

16

Bits

ANALOG INPUT

Capacitance

50

50

pF

THROUGHPUT SPEED

Conversion cycle

Acquire and convert

4

4

µs

Throughput rate

250

250

kHz

DC ACCURACY

INL

Integral linearity error

-3

3

-2

2

DNL

Differential linearity error

-2

2

-1

1

LSB

No missing codes

15

16

Bits

1

1

LSB

±10 V range

Int. Ref. with 0.1% external

-0.5

0.5

-0.5

0.5

Full-scale

%FSR

fixed resistors

All other ranges

-0.5

0.5

-0.5

0.5

Full-scale error drift

Int. Ref.

±7

±7

ppm/°C

±10 V range

Ext. Ref. with 0.1% external

-0.5

0.5

-0.5

0.5

Full-scale

%FSR

fixed resistors

All other ranges

-0.5

0.5

-0.5

0.5

Full-scale error drift

Ext. Ref.

±2

±2

ppm/°C

-10

10

-5

5

mV

Bipolar zero error drift

±0.4

±0.4

ppm/°C

10 V range

-5

5

-5

5

Unipolar zero

mV

4 V and 5 V

-3

3

-3

3

range

Unipolar zero error drift

±2

±2

ppm/°C

Recovery to rated accuracy after

1-µF Capacitor to CAP

1

1

ms

power down

Power supply sensitivity

-8

8

-8

8

LSB

AC ACCURACY

SFDR

Spurious-free dynamic range

90

99

95

99

THD

Total harmonic distortion

-98

-90

-98

-93

dB

SINAD

83

88

85

88

dB

Signal-to-(noise+distortion)

–60-dB Input

30

32

dB

SNR

Signal-to-noise ratio

83

88

86

88

dB

500

500

kHz

SAMPLING DYNAMICS

Aperture delay

5

5

ns

Transient response

FS Step

2

2

µs

150

150

ns

(1)

±10 V, 0 V to 5 V, etc. (see Table 3)

(2)

LSB means least significant bit. For the ±10-V input range, one LSB is 305 µV.

(3)

Typical rms noise at worst case transitions and temperatures.

(4)

As measured with fixed resistors shown in Figure 29 and Figure 30. Adjustable to zero with external potentiometer. Factory calibrated

with 0.1%, 0.25 W resistors.

(5)

For bipolar input ranges, full-scale error is the worst case of -full-scale or +full-scale uncalibrated 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.

(6)

All specifications in dB are referred to a full-scale ±10-V input.

(7)

Full-power bandwidth is defined as the full-scale input frequency at which signal-to-(noise + distortion) degrades to 60 dB.

(8)

Recovers to specified performance after 2 x FS input overvoltage.

3