LTC1859 查看數據表（PDF） - Linear Technology

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产品描述 (功能)

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LTC1859

8-Channel, 12-/14-/16-Bit, 100ksps SoftSpan A/D Converters with Shutdown

Linear Technology 

APPLICATIONS INFORMATION

LTC1857/LTC1858/LTC1859

AVDD DVDD

CH0

CH1

•

INPUT MUX

•

AND

RANGE

•

SELECT

CH7

COM

MUX ADDRESS AND RANGE

INTERNAL

CLOCK

CONTROL

LOGIC

+

12-/14-/16-BIT

SAMPLING ADC

–

DATA OUT

2.5V

REFERENCE

8k

4.096V

1.6384X

SERIAL I/O

CONVST

SDI

BUSY

SCK

RD

OVDD

SDO

MUXOUT–

AGND1

MUXOUT+ ADC+

ADC–

VREF

REFCOMP

1859 BD

AGND2 AGND3 DGND

Figure 1. LTC1857/LTC1858/LTC1859 Simplified Equivalent Circuit

AIN+

CH0

3000pF

AIN–

CH1

••••

MUXOUT+

MUXOUT–

ADC+

ADC–

1859 F02

Figure 2. Analog Input Filtering

LT1227: 140MHz video current feedback amplifier. 10mA

supply current. ±5V to ±15V supplies. Low noise and low

distortion.

LT1468/LT1469: Single and dual 90MHz, 16-bit accurate

op amp. Good AC/DC specs.

LT1677: Single, low noise op amp. Rail-to-rail input and

output. Up to ±15V supplies.

LT1792: Single, low noise JFET input op amp, ±5V sup-

plies.

LT1793: Single, low noise JFET input op amp, 10pA bias

current, ±5V supplies.

LT1881/LT1882: Dual and quad, 200pA bias current, rail-

to-rail output op amps. Up to ±15V supplies.

LT1844/LT1885: Dual and quad, 400pA bias current,

rail-to-rail output op amps. Up to ±15V supplies. Faster

response and settling time.

INTERNAL VOLTAGE REFERENCE

The LTC1857/LTC1858/LTC1859 have an on-chip, tem-

perature compensated, curvature corrected, bandgap

reference, which is factory trimmed to 2.50V. The full-scale

range of the LTC1857/LTC1858/LTC1859 is equal to ±5V,

0V to 5V, ±10V or 0V to 10V. The output of the reference is

connected to the input of a gain of 1.6384x buffer through

an 8k resistor (see Figure 3). The input to the buffer or

For more information www.linear.com/LTC1857

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