LTC2356-14| Datasheet

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LTC2356-12/LTC2356-14 Serial 12-Bit/14-Bit, 3.5Msps Sampling ADCs with Shutdown

FEATURES

DESCRIPTIO

3.5Msps Conversion Rate 74.1dB SINAD at 14-Bits, 71.1dB SINAD at 12-Bits Low Power Dissipation: 18mW 3.3V Single Supply Operation 2.5V Internal Bandgap Reference can be Overdriven 3-Wire SPI-Compatible Serial Interface Sleep (13uW) Shutdown Mode Nap (4mW) Shutdown Mode 80dB Common Mode Rejection 1.25V Bipolar Input Range Tiny 10-Lead MSOP Package

The LTC 2356-12/LTC2356-14 are 12-bit/14-bit, 3.5Msps serial ADCs with differential inputs. The devices draw only 5.5mA from a single 3.3V supply and come in a tiny 10-lead MSOP package. A Sleep shutdown feature further reduces power consumption to 13uW. The combination of speed, low power and tiny package makes the LTC2356-12/ LTC2356-14 suitable for high speed, portable applications. The 80dB common mode rejection allows users to eliminate ground loops and common mode noise by measuring signals differentially from the source. The devices convert 1.25V to 1.25V bipolar inputs differentially. The absolute voltage swing for AIN+ and AIN extends from ground to the supply voltage. The serial interface sends out the conversion results during the 16 clock cycles following a CONV rising edge for compatibility with standard serial interfaces. If two additional clock cycles for acquisition time are allowed after the data stream in between conversions, the full sampling rate of 3.5Msps can be achieved with a 63MHz
clock.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

APPLICATIO S

Communications Data Acquisition Systems Uninterrupted Power Supplies Multiphase Motor Control Multiplexed Data Acquisition RFID

BLOCK DIAGRA

10uF 3.3V

LTC2356-14 AIN+ AIN 1

7

VDD

+
S&H 14-BIT ADC

14-BIT LATCH

8

SDO

THD, 2nd, 3rd (dB)

2

VREF 2.5V REFERENCE

THREESTATE SERIAL OUTPUT PORT 14

3 10uF 4

10 TIMING LOGIC 9 6 11
2356 BD

CONV

GND 5

SCK

EXPOSED PAD

U
THD, 2nd and 3rd vs Input Frequency for Differential Input Signals
50 56 62 68 74 80 86 92 98 104 0.1 1 10 FREQUENCY (MHz) 100
2356 G02

W

U

THD 2nd 3rd

2356f

1

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LTC2356-14 DATASHEET