LTC1606ACSW datasheet(10/16 Pages) LINER

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LTC1606

1606fa

changing between 1111 1111 1111 1111 and 0000 0000

0000 0000. The gain error is trimmed by adjusting resistor

R4. An input voltage of 9.999542V (+FS – 1.5LSB) is

applied to VIN and R4 is adjusted until the output code is

changing between 0111 1111 1111 1110 and 0111 1111

1111 1111. Figure 6 shows the bipolar transfer character-

istic of the LTC1606.

If the external resistors are not used, the resulting offset

and gain error ranges are shown in Table 1.

DC Performance

One way of measuring the transition noise associated with

a high resolution ADC is to use a technique where a DC

signal is applied to the input of the ADC and the resulting

output codes are collected over a large number of conver-

sions. For example in Figure 7, the distribution of output

code is shown for a DC input that has been digitized 4096

times. The distribution is Gaussian and the RMS code

transition is about 0.65LSB.

DIGITAL INTERFACE

Internal Clock

The ADC has an internal clock that is trimmed to achieve

a typical conversion time of 2.3

µs. No external adjust-

ments are required and, with the typical acquisition time of

µs, throughput performance of 250ksps is assured.

µF

2.2

µF

33.2k

100k

±10V INPUT

200

Ω

VIN

AGND1

REF

CAP

AGND2

LTC1606

1606 • F05

392k

50k

Figure 5.

±10V Input with Offset and Gain Trim

INPUT VOLTAGE (V)

–1

LSB

1606 • F06

011...111

011...110

000...001

000...000

100...000

100...001

111...110

LSB

BIPOLAR

ZERO

111...111

FS/2 – 1LSB

–FS/2

FS = 20V

1LSB = FS/65536

Figure 6. LTC1606 Bipolar Transfer Characteristics

Table 1

WITH BOTH EXTERNAL

WITHOUT THE EXTERNAL

WITHOUT EITHER EXTERNAL

ERROR TERM

RESISTORS INCLUDED

33.2k RESISTOR

RESISTOR INCLUDED

Offset Error

– 10mV < Error < 10mV

10mV < Error< 55mV

54mV < Error < 155mV

+ Full-Scale Error

– 0.25% < Error < 0.25%

– 0.50% < Error < 0.50%

– 1.3% < Error < –0.10%

– 3.40% < Error < –0.85%

– Full-Scale Error

– 0.25% < Error < 0.25%

– 0.50% < Error < 0.50%

0.25% < Error < 1.40%

2.10% < Error < 6.15%

APPLICATIO S I FOR ATIO

Figure 7. Histogram for 4096 Conversions

2500

2000

1500

1000

500

–3

–2

–1

CODE

1606 • F07

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