Datasheet LTC1415 (Analog Devices)

LTC1415 12-Bit, 1.25Msps, 55mW Sampling A/D Converter
U FEATU S RE DESCRIPTIO
■
1.25Msps Sample Rate
The LTC®1415 is a 700ns, 1.25Msps, 12-bit sampling ■
Single 5V Supply
A/D converter that draws only 55mW from a single 5V ■
Power Dissipation: 55mW
supply. This easy-to-use device includes a high dynamic ■
Nap and Sleep Power Shutdown Modes
range sample-and-hold, precision reference and a trimmed ■ ±
0.35LSB INL and
±
0.25LSB DNL
internal clock. Two power shutdown modes provide flex- ■ 72dB S/(N + D) and 80dB THD at 100kHz ibility for low power systems. ■ External or Internal Reference Operation The LTC1415’s full-scale input range is 4.096V. Low ■ True Differential Inputs Reject Common Mode Noise linearity errors ±0.35LSB INL, ± 0.25LSB DNL make it ■ Input Range: 4.096V (1mV/LSB) ideal for imaging systems. Outstanding AC performance ■ 28-Pin SSOP and SO Packages includes 72dB S/(N + D) and 80dB THD with an input frequency of 100kHz.
O U APPLICATI S
The unique differential input sample-and-hold can acquire ■ single-ended or differential input signals up to its 18MHz High Speed Data Acquisition ■ bandwidth. The 60dB common mode rejection allows Imaging Systems ■ users to eliminate ground loops and common mode noise Digital Signal Processing ■ by measuring signals differentially from the source. Multiplexed Data Acquisition Systems ■ Telecommunications The ADC has a µP compatible, 12-bit parallel output port. There is no pipeline delay in the conversion results. A separate convert start input and data ready signal (BUSY) ease connections to FIFOs, DSPs and microprocessors. A separate output logic supply pin allows direct connection , LTC and LT are registered trademarks of Linear Technology Corporation. to 3V components.
O U TYPICAL APPLICATI 1.25MHz, 12-Bit Sampling A/D Converter Effective Bits and Signal-to-(Noise + Distortion)
LTC1415 5V
vs Input Frequency
DIFFERENTIAL 1 28 ANALOG INPUT +AIN AVDD 12 74 2 27 (0V TO 4.096V) –AIN DVDD 10µF 11 68 SIGNAL/(NOISE + DISTORTION) (dB) 3 26 2.50V OUTPUT LOGIC V NYQUIST REF OVDD 10 62 VREF OUTPUT 4 25 SUPPLY 3V OR 5V FREQUENCY REFCOMP BUSY 9 56 5 24 10µF AGND CS 8 6 23 D11(MSB) CONVST µP CONTROL 7 7 22 D10 RD LINES 6 8 21 D9 SHDN 5 9 20 D8 NAP/SLP EFFECTIVE BITS 4 10 19 D7 OGND 3 12-BIT 11 18 D6 D0 2 PARALLEL 12 17 BUS D5 D1 1 fSAMPLE = 1.25Msps 13 16 D4 D2 0 14 15 1k 10k 100k 1M 2M DGND D3 INPUT FREQUENCY (Hz) LTC1415 • TA02 1415 TA01 1