LTC2312-12_15 Datasheet, PDF (1/22 Pages) Linear Technology – 12-Bit, 500ksps Serial Sampling ADC in TSOT

LTC2312-12
12-Bit, 500ksps Serial
Sampling ADC in TSOT
Features
n _{500ksps Throughput Rate}
n _{No Cycle Latency}
n _{Guaranteed 12-Bit No Missing Codes}
n _{Single 3V or 5V Supply}
n _{Low Noise: 73dB SNR}
n _{Low Power: 8mW at 500ksps and 3V Supply}
n _{Low Drift (20ppm/°C Maximum) 2.048V or 4.096V}
Internal Reference
n _{Sleep Mode with < 1µA Typical Supply Current}
n _{Nap Mode with Quick Wake-Up < 1 Conversion}
n _{Separate 1.8V to 5V Digital I/O Supply}
n _{High Speed SPI-Compatible Serial I/O}
n _{Guaranteed Operation from –40°C to 125°C}
n _{8-Lead TSOT-23 Package}
Applications
n _{Communication Systems}
n _{High Speed Data Acquisition}
n _{Handheld Terminal Interface}
n _{Medical Imaging}
n _{Uninterrupted Power Supplies}
n _{Battery Operated Systems}
n _Automotive
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Description
The LTC^®2312-12 is a 12-bit, 500ksps, serial sampling
A/D converter that draws only 3mA from a single 3V or
5V supply. The LTC2312-12 contains an integrated low
drift reference and reference buffer providing a low cost,
high performance (20ppm/°C maximum) and space sav-
ing solution. The LTC2312-12 achieves outstanding AC
performance of 72.7dB SINAD and –84dB THD while
sampling at 500ksps. The extremely high sample rate-to-
power ratio makes the LTC2312-12 ideal for compact, low
power, high speed systems. The supply current decreases
at lower sampling rates as the device automatically enters
nap mode after conversions.
The LTC2312-12 has a high speed SPI-compatible serial
interface that supports 1.8V, 2.5V, 3V and 5V logic. The
fast 500ksps throughput with no-cycle latency makes
the LTC2312-12 ideally suited for a wide variety of high
speed applications.
Complete 14-/12-Bit Pin-Compatible SAR ADC Family
500ksps 2.5Msps 4.5Msps
5Msps
14-Bit
LTC2312-14 LTC2313-14 LTC2314-14
12-Bit
LTC2312-12 LTC2313-12
LTC2315-12
Power 3V/5V 9mW/15mW 14mW/25mW 18mW/31mW 19mW/32mW
Typical Application
5V Supply, Internal Reference, 500ksps, 12-Bit Sampling ADC
5V
2.2µF
2.2µF
LTC2312-12
V_DD CONV
REF SCK
ANALOG INPUT
0V TO 4.096V
GND SDO
A_IN OV_DD
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP
OR SHIFT REGISTERS
DIGITAL OUTPUT SUPPLY
1.8V TO 5V
2.2µF
16k Point FFT, f_S = 500ksps, f_IN = 259kHz
0
V_DD = 5V
–20 ^{SNR = 73dBFS}
SINAD = 72.7dBFS
–40 ^{THD = –84dB}
SFDR = 88dB
–60
–80
–100
–120
–140
231212 TA01a
–160
0
50
100 150 200 250
INPUT FREQUENCY (kHz) _{231212 TA01b}
231212fa
For more information www.linear.com/LTC2312-12
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