CS5529(1997) Просмотр технического описания (PDF) - Cirrus Logic

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CS5529
(Rev.:1997)

16-Bit, Programmable ∆Σ ADC with 6-Bit Latch

Cirrus Logic 

CS5529

FAQs

20) How do the voltage references differ between the CS5525/26 and the

CS5529?

A: The CS5529 supports differential reference voltages up to the analog

supply allowing the analog supply to serve as the reference voltage. The

reference’s inputs are buffered through a coarse/fine charge buffer.

Since the inputs are buffered, the dynamic current is typically 8 nA and is

independent of the reference voltage. The CS5525/26 do not have buffers

yet support a differential reference voltage up to 3.0 V. Since their refer-

ence inputs aren’t buffered the dynamic input current is typically 1.2 µA/

V.

21) How do the CS5525/26 and the CS5529 analog input ranges differ?

A: The CS5529 has a nominal input range of ±2.5 V (with VREF=2.5 V).

The analog inputs for this range have a coarse/fine charge buffer which

reduces the dynamic current to typically 16 nA. The CS5525/26 have an

instrumentation amplifier and a programmable gain amplifier which pro-

vides nominal input ranges of 25 mV, 55 mV, and 100 mV. The instru-

mentation amplifier is a chopper stabilized amplifier and serves as a

buffer reducing the dynamic input current to typically 100 pA. In the 1

V, 2.5 V, and 5 V ranges of the CS5525/26, the instrumentation amplifier

is bypassed and no buffer exists to reduce the input current. In these

ranges the input current is typically 1.2 µA/V.

22) How do the output word rates differ between the CS5525/26 and the

CS5529?

A: All three converters have eight output word rates. The CS5529 samples at

½ the rate of the CS5525/26. Therefore, the CS5529’s output word rate

are ½ the CS5525/26.

PI246PP1 OCT ‘97

9

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