CS5531-AS Просмотр технического описания (PDF) - Cirrus Logic

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CS5531-AS

16-bit and 24-bit ADCs withUltra-low-noise PGIA

Cirrus Logic 

CS5531/32/33/34-AS

Filter Rate Select, FRS[19]

0

Use the default output word rates.

1

Scale all output word rates and their corresponding filter characteristics by a factor of 5/6.

NU (Not Used)[18:0]

0

Must always be logic 0. Reserved for future upgrades.

2.4. Setting up the CSRs for a Measurement

The CS5531/32/33/34 have four channel-setup reg-

isters (CSRs). Each CSR contains two 16-bit Setups

which are programmed by the user to contain data

conversion information such as: 1) which physical

channel will be converted, 2) at what gain will the

channel be converted, 3) at what word rate will the

channel be converted, 4) will the output conversion

be unipolar or bipolar, 5) what will be the state of the

output latch during the conversion, 6) will the con-

verter delay the start of a conversion to allow time

for the output latch to settle before the conversion is

begun, and 7) will the open circuit detect current

source be activated for that Setup. In addition, when

the OGS bit in the Configuration Register is set, the

Setup selects which set of offset and gain registers to

use when performing conversions or calibrations.

Note that a particular physical input channel can be

represented in more than one Setup with different

output rates, gain ranges, etc. (i.e. each Setup is in-

dependently defined). Refer to section 2.4.1 for

more details about the Channel Setup Registers.

Each 32-bit CSR is individually accessible and

contains two 16-bit Setups. As an example, to con-

figure Setup 1 in the CS5531/32/33/34 with the

write individual channel-setup register command

(0x05 hexadecimal), bits 31 to 16 of CSR 1 con-

tains the information for Setup 1 and bits 15 to 0

contain the information for Setup 2. Note that while

reading/writing CSRs, two Setups are accessed in

pairs as a single 32-bit CSR register. Even if one of

the Setups isn’t used, it must be written to or read.

Examples detailing the power of the CSRs are pro-

vided in section 2.6.3.

DS289F5

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