CH0+ CH0–
參數(shù)資料
型號(hào)： LTC2351HUH-14#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 6/20頁(yè)
文件大?。?/td> 0K
描述： IC ADC 14BIT 1.5MSPS 32-QFN
標(biāo)準(zhǔn)包裝： 2,500
位數(shù)： 14
采樣率（每秒）： 1.5M
數(shù)據(jù)接口： 串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 16.5mW
電壓電源： 單電源
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 32-WFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 32-QFN 裸露焊盤(pán)（5x5）
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 12 個(gè)單端，單極；12 個(gè)單端，雙極；6 個(gè)差分，單極；6 個(gè)差分，雙極
配用： DC1278A-ND - BOARD SAR ADC LTC2351-14
LTC2351-14
14
235114fb
LTC2351-14
CH0+
CH0–
VREF
GND
235114 F01
1
2
11
3
10μF
47pF*
51Ω*
CH1+
CH1–
4
5
47pF*
*TIGHT TOLERANCE REQUIRED TO AVOID
APERTURE SKEW DEGRADATION
51Ω*
ANALOG
INPUT
ANALOG
INPUT
APPLICATIONS INFORMATION
INPUT FILTERING AND SOURCE IMPEDANCE
The noise and the distortion of the input amplier and
other circuitry must be considered since they will add to
the LTC2351-14 noise and distortion. The small-signal
bandwidth of the sample-and-hold circuit is 50MHz. Any
noise or distortion products that are present at the analog
inputs will be summed over this entire bandwidth. Noisy
input circuitry should be ltered prior to the analog inputs.
A simple 1-pole RC lter is sufcient for many applications.
For example, Figure 1 shows a 47pF capacitor from CH0+
to ground and a 51Ω source resistor to limit the net input
bandwidth to 30MHz. The 47pF capacitor also acts as a
charge reservoir for the input sample-and-hold and isolates
the ADC input from sampling-glitch sensitive circuitry. High
quality capacitors and resistors should be used since these
components can add distortion. NPO and silvermica type
dielectric capacitors have excellent linearity. Carbon surface
mount resistors can generate distortion from self heating
and from damage that may occur during soldering. Metal
lm surface mount resistors are much less susceptible to
both problems. When high amplitude unwanted signals
are close in frequency to the desired signal frequency a
multiple pole lter is required.
High external source resistance, combined with 13pF
of input capacitance, will reduce the rated 50MHz input
bandwidth and increase acquisition time beyond 39ns.
INPUT RANGE
The analog inputs of the LTC2351-14 may be driven fully
differentially with a single supply. Either input may swing
up to VCC, provided the differential swing is no greater
than 2.5V with BIP (Pin 29) LOW, or ±1.25V with (BIP Pin
29) HIGH. The 0V to 2.5V range is also ideally suited for
single-ended input use with single supply applications. The
common mode range of the inputs extend from ground
to the supply voltage VCC. If the difference between the
CH+ and CH– at any input pair exceeds 2.5V (unipolar) or
1.25V (bipolar), the output code will stay xed at positive
full-scale, and if this difference goes below 0V (unipolar) or
–1.25V (bipolar), the output code will stay xed at nega-
tive full-scale.
INTERNAL REFERENCE
The LTC2351-14 has an on-chip, temperature compen-
sated, bandgap reference that is factory trimmed to 2.5V
to obtain a precise 2.5V input span. The reference amplier
output VREF, (Pin 23) must be bypassed with a capacitor
to ground. The reference amplier is stable with capaci-
tors of 1μF, or greater. For the best noise performance, a
10μF ceramic or a 10μF tantalum in parallel with a 0.1μF
ceramic is recommended. The VREF pin can be overdriven
with an external reference as shown in Figure 2. The
voltage of the external reference must be higher than the
2.5V of the open-drain P-channel output of the internal
reference. The recommended range for an external refer-
ence is 2.55V to VDD. An external reference at 2.55V will
see a DC quiescent load of 0.75mA and as much as 3mA
during conversion.
Figure 1. RC Input Filter
Figure 2. External Reference
LTC2351-14
VREF
GND
235114 F02
23
22
10μF
LT1790-3
3.5V to 18V
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