CS5501 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS5501

Non-aliasing, 16- & 20-bit A/D Converters

Cirrus Logic 

CDB5501 CDB5503

CDB5501/CDB5503

Switch

SW1-1

SW1-2

SW1-3

SW1-4

ON

SC2 = 0

OFF

SC2 = 1

SC1 = 0 SC1 = 1

UNIPOLAR BIPOLAR

SLEEP AWAKE

CAL

SC1 SC2 Cal Type ZS Cal FS Cal

00

Self-Cal AGND VREF

1 1 System Offset AIN

-

0 1 & System Gain -

AIN

1 0 System Offset AIN VREF

Sequence

One Step

1st Step

2nd Step

One Step

Table 5. DIP Switch Selections

Table 6. Calibration Mode Table

"D" input to flip-flop U8B is enabled to a "1" at

the same time CS goes low. When DRDY returns

high flip-flop U8B is toggled and resets the

counter back to zero which terminates the CS en-

able. The counter then accumulates counts until

the selected output activates CS low once again.

DIP Switch Selections/Calibration Initiation

Several control pins of the CS5501/CS5503 can

be level activated by DIP switch selection, or by

microcontroller at P8, as shown in Figure 5. DIP

switch SW1 selections are depicted in Tables 5

and 6. The CAL pushbutton is used to initiate a

calibration cycle in accordance with DIP switch

positions 1 and 2. The CAL pushbutton should be

SC2

17

V+

SC1

4

U4

CS5501/

CS5503

CAL

13

BP/UP

12

SLEEP

11

SW1 1

2

3

4

SW2

CAL

V+

P8

SC2

SC1

B/U

SLP

CAL

WARNING: Some evaluation boards were produced with the

SC1 and SC2 labels reversed on the silkscreen

Figure 5. DIP Switch / Header Control Pin Selection

activated any time power is first applied to the

board or any time the conversion mode (BP/UP)

is changed on the DIP switch. Remote control of

the CAL signal is available on connector P8.

Connector P8 also allows access to the DIP

switch functions by a microcomputer/microcon-

troller. The DIP switches should be placed in the

off position if off-board control of the signals on

connector P8 is implemented.

Voltage Reference

The evaluation board includes a 2.5 volt refer-

ence. Potentiometer R9 can be used to trim the

reference output to a precise value.

Analog Input Range: Unipolar Mode

The value of the reference voltage sets the analog

input signal range. In unipolar mode the analog

input range extends from AGND to VREF. If the

analog input goes above VREF the converter will

output all "1’s". If the input goes below AGND,

the CS5501/CS5503 will output all "0’s".

Analog Input Range: Bipolar Mode

The analog signal input range in the bipolar mode

is set by the reference to be from +VREF to -

VREF. If the input signal goes above +VREF, the

CS5501/CS5503 will output all "1’s". Input sig-

nals below -VREF cause the output data to be all

"0’s".

5500

DS31DB43

Share Link: