Datasheet LTC1850, LTC1851 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 8-Channel, 12-Bit, 1.25Msps Sampling ADCs |
| Pages / Page | 28 / 1 — FEATURES. DESCRIPTIO. Flexible 8-Channel Multiplexer. Single-Ended or … |
| File Format / Size | PDF / 295 Kb |
| Document Language | English |
FEATURES. DESCRIPTIO. Flexible 8-Channel Multiplexer. Single-Ended or Differential Inputs
Model Line for this Datasheet
Text Version of Document
LTC1850/LTC1851 8-Channel, 10-Bit/12-Bit, 1.25Msps Sampling ADCs
U FEATURES DESCRIPTIO
■
Flexible 8-Channel Multiplexer
The 10-bit LTC®1850 and 12-bit LTC1851 are complete ■
Single-Ended or Differential Inputs
8-channel data acquisition systems. They include a flex- ■
Two Gain Ranges Plus Unipolar and Bipolar
ible 8-channel multiplexer, a 1.25Msps successive approxi-
Operation
mation analog-to-digital converter with sample-and-hold, ■
1.25Msps Sampling Rate
an internal 2.5V reference and reference buffer amplifier, ■
Single 5V Supply and 40mW Power Dissipation
and a parallel output interface. The multiplexer can be con- ■
Scan Mode and Programmable Sequencer
figured for single-ended or differential inputs, two gain ■ Pin Compatible 10-Bit LTC1850 and 12-Bit LTC1851 ranges and unipolar or bipolar operation. ■ True Differential Inputs Reject Common Mode Noise The ADCs have a scan mode that will repeatedly cycle ■ Internal 2.5V Reference through all 8 multiplexer channels and can also be ■ Parallel Output Includes MUX Address programmed with a sequence of up to 16 addresses and ■ Easy Interface to 3V Logic configurations that can be scanned in succession. The ■ Nap and Sleep Shutdown Modes sequence memory can also be read back. The reference
U
and buffer amplifier provide pin strappable ranges of
APPLICATIO S
4.096V, 2.5V and 2.048V. The parallel output includes ■ High Speed Data Acquisition the 10-bit or 12-bit conversion result plus the 4-bit ■ Test and Measurement multiplexer address. The digital outputs are powered ■ Imaging Systems from a separate supply allowing for easy interface to 3V ■ Telecommunications digital logic. Typical power consumption is 40mW at ■ Industrial Process Control 1.25Msps from a single 5V supply. ■ Spectrum Analysis , LTC and LT are registered trademarks of Linear Technology Corporation.
W BLOCK DIAGRA
LTC1851 M1 CH0 SHDN CS CH1 CONVST RD CONTROL LOGIC CH2 WR AND DIFF PROGRAMMABLE
Integral Linearity, LTC1851
A2 CH3 SEQUENCER A1 1.00 8-CHANNEL A0 INTERNAL CH4 MULTIPLEXER UNI/BIP CLOCK PGA M0 CH5 0.50 OVDD CH6 BUSY DIFFOUT/S6 0.00 CH7 A2OUT/S5 A1OUT/S4 A0 COM OUT/S3 D11/S2 INL COC ERROR (LSBs) –0.50 D10/S1 2.5V D9/S0 REFOUT 12-BIT DATA OUTPUT REFERENCE D8 1.25Msps ADC LATCHES DRIVERS D7 –1.00 D6 0 512 1024 1536 2048 2560 3072 3584 4096 D5 CODE D4 D3 LTC1850/51 G01 REFIN REF AMP D2 D1 D0 OGND REFCOMP 1851 BD 18501f 1
U FEATURES DESCRIPTIO
■
Flexible 8-Channel Multiplexer
The 10-bit LTC®1850 and 12-bit LTC1851 are complete ■
Single-Ended or Differential Inputs
8-channel data acquisition systems. They include a flex- ■
Two Gain Ranges Plus Unipolar and Bipolar
ible 8-channel multiplexer, a 1.25Msps successive approxi-
Operation
mation analog-to-digital converter with sample-and-hold, ■
1.25Msps Sampling Rate
an internal 2.5V reference and reference buffer amplifier, ■
Single 5V Supply and 40mW Power Dissipation
and a parallel output interface. The multiplexer can be con- ■
Scan Mode and Programmable Sequencer
figured for single-ended or differential inputs, two gain ■ Pin Compatible 10-Bit LTC1850 and 12-Bit LTC1851 ranges and unipolar or bipolar operation. ■ True Differential Inputs Reject Common Mode Noise The ADCs have a scan mode that will repeatedly cycle ■ Internal 2.5V Reference through all 8 multiplexer channels and can also be ■ Parallel Output Includes MUX Address programmed with a sequence of up to 16 addresses and ■ Easy Interface to 3V Logic configurations that can be scanned in succession. The ■ Nap and Sleep Shutdown Modes sequence memory can also be read back. The reference
U
and buffer amplifier provide pin strappable ranges of
APPLICATIO S
4.096V, 2.5V and 2.048V. The parallel output includes ■ High Speed Data Acquisition the 10-bit or 12-bit conversion result plus the 4-bit ■ Test and Measurement multiplexer address. The digital outputs are powered ■ Imaging Systems from a separate supply allowing for easy interface to 3V ■ Telecommunications digital logic. Typical power consumption is 40mW at ■ Industrial Process Control 1.25Msps from a single 5V supply. ■ Spectrum Analysis , LTC and LT are registered trademarks of Linear Technology Corporation.
W BLOCK DIAGRA
LTC1851 M1 CH0 SHDN CS CH1 CONVST RD CONTROL LOGIC CH2 WR AND DIFF PROGRAMMABLE
Integral Linearity, LTC1851
A2 CH3 SEQUENCER A1 1.00 8-CHANNEL A0 INTERNAL CH4 MULTIPLEXER UNI/BIP CLOCK PGA M0 CH5 0.50 OVDD CH6 BUSY DIFFOUT/S6 0.00 CH7 A2OUT/S5 A1OUT/S4 A0 COM OUT/S3 D11/S2 INL COC ERROR (LSBs) –0.50 D10/S1 2.5V D9/S0 REFOUT 12-BIT DATA OUTPUT REFERENCE D8 1.25Msps ADC LATCHES DRIVERS D7 –1.00 D6 0 512 1024 1536 2048 2560 3072 3584 4096 D5 CODE D4 D3 LTC1850/51 G01 REFIN REF AMP D2 D1 D0 OGND REFCOMP 1851 BD 18501f 1
