LTC2460CMS datasheet(6/20 Pages) LINER

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LTC2460/LTC2462

24602f

PIN FUNCTIONS

REFOUT (Pin 1): Reference Output Pin. Nominally 1.25V,

this voltage sets the fullscale input range of the ADC. For

noise and reference stability connect to a 0.1μF capacitor

tied to GND. This capacitor value must be less than or

equal to the capacitor tied to the reference compensation

pin (COMP). REFOUT cannot be overdriven by an external

reference. For applications that require an input range

greater than 0V to 1.25V, please refer to the LTC2450/

LTC2452.

COMP (Pin 2): Internal Reference Compensation Pin. For

low noise and reference stability, tie a 0.1μF capacitor to

GND.

CS (Pin 3): Chip Select (Active LOW) Digital Input. A LOW

on this pin enables the SDO output. A HIGH on this pin

places the SDO output pin in a high impedance state and

any inputs on SDI and SCK will be ignored.

SDI (Pin 4): Serial Data Input Pin. This pin is used to

program the sleep mode and 30Hz/60Hz output rate

(LTC2460).

SCK (Pin 5): Serial Clock Input. SCK synchronizes the

serial data input/output. Once the conversion is complete,

a new data bit is produced at the SDO pin following each

SCK falling edge. Data is shifted into the SDI pin on each

rising edge of SCK.

SDO (Pin 6): Three-State Serial Data Output. SDO is used

for serial data output during the DATA INPUT/OUTPUT state

and can be used to monitor the conversion status.

GND (Pins 7, 11): Ground. Connect directly to the ground

plane through a low impedance connection.

REF– (Pin 8):

Negative Reference Input to the ADC. The

voltage on this pin sets the zero input to the ADC. This

pin should tie directly to ground or the ground sense of

the input sensor.

IN+ (LTC2462), IN (LTC2460) (Pin 9):

Positive input volt-

age for the LTC2462 differential device. ADC input for the

LTC2460 single-ended device.

IN– (LTC2462), GND (LTC2460) (Pin 10):

Negative input

voltage for the LTC2462 differential device. GND for the

LTC2460 single-ended device.

VCC (Pin 12): Positive Supply Voltage. Bypass to GND

with a 10μF capacitor in parallel with a low-series-induc-

tance 0.1μF capacitor located as close to the device as

possible.

Exposed Pad (Pin 13 – DFN Package): Ground. Connect

directly to the ground plane through a low impedance

connection.

TYPICAL PERFORMANCE CHARACTERISTICS (T

A = 25°C, unless otherwise noted)

Power Supply Rejection

vs Frequency at VCC

Conversion Time vs Temperature

FREQUENCY AT VCC (Hz)

24602 G10

–20

–40

–60

–80

–100

–120

10k

100k

100

10M

TEMPERATURE (°C)

–50

24602 G11

–25

100

VCC = 5V, 4.1V, 3V

VREF vs VCC

2.0

3.5

2.5

4.0

3.0

5.0

5.5

4.5

6.0

VCC (V)

1.24892

1.24891

24602 G12

1.24884

1.24885

1.24886

1.24887

1.24888

1.24889

1.24890

TA = 25°C

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