LTC1604

1

1604fa

TYPICAL APPLICATION

FEATURES

DESCRIPTION

High Speed, 16-Bit, 333ksps

Sampling A/D Converter

with Shutdown

verter that draws only 220mW from ±5V supplies. This

high performance device includes a high dynamic range

sample-and-hold, a precision reference and a high speed

parallel output. Two digitally selectable power shutdown

modes provide power savings for low power systems.

The LTC1604’s full-scale input range is ±2.5V. Outstand-

ing AC performance includes 90dB S/(N+D) and –100dB

THD at a sample rate of 333ksps.

The unique differential input sample-and-hold can acquire

single-ended or differential input signals up to its 15MHz

bandwidth. The 68dB common mode rejection allows

users to eliminate ground loops and common mode noise

by measuring signals differentially from the source.

The ADC has μP compatible,16-bit parallel output port.

There is no pipeline delay in conversion results. A separate

convert start input and a data ready signal (BUSY) ease

connections to FlFOs, DSPs and microprocessors.

LTC1604 4096 Point FFT

APPLICATIONS

or External Reference

L, LTC and LT are registered trademarks of Linear Technology Corporation.

2.2μF

10μF

10μF

10Ω

47μF

4

6

DIFFERENTIAL

ANALOG INPUT

±2.5V

REFCOMP

4.375V

CONTROL

LOGIC

AND

TIMING

B15 TO B0

16-BIT

SAMPLING

ADC

–

+

10μF

5V OR

3V

μP

CONTROL

LINES

D15 TO D0

OUTPUT

BUFFERS

16-BIT

PARALLEL

BUS

11 TO 26

1604 TA01

OGND

28

29

1

2

+

–

SHDN

CS

CONVST

RD

BUSY

33

32

31

30

27

7.5k

3

36

35

10

9

5V

5V

DGND

8

AGND

AGND

7

AGND

5

AGND

34

–5V

10μF

2.5V

REF

10μF

1.75X

+

+

+

+

+

FREQUENCY (kHz)

0

120

1604 TA02

40

80

160

0

–20

–40

–60

–80

–100

–120

–140

20

60

100

140

SINAD = 89dB

THD = –96dB