參數(shù)資料
型號(hào): LTC2158IUP-14#TRPBF
廠商: Linear Technology
文件頁(yè)數(shù): 5/28頁(yè)
文件大?。?/td> 0K
描述: IC ADC DUAL 14BIT 310M 64-QFN
標(biāo)準(zhǔn)包裝: 2,000
位數(shù): 14
采樣率(每秒): 310M
數(shù)據(jù)接口: 并聯(lián),串行,SPI
轉(zhuǎn)換器數(shù)目: 2
功率耗散(最大): 873mW
電壓電源: 模擬和數(shù)字
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 64-QFN(9x9)
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 2 個(gè)差分
配用: DC1371A-ND - BOARD USB DATA ACQUISITION HS
13
215814f
LTC2158-14
CONVERTER OPERATION
The LTC2158-14 is a two-channel, 14-bit 310Msps
A/D converter powered by a single 1.8V supply. The
analog inputs must be driven differentially. The en-
code inputs should be driven differentially for optimal
performance. The digital outputs are double data rate
LVDS. Additional features can be chosen by programming
the mode control registers through a serial SPI port.
ANALOG INPUT
The analog inputs are differential CMOS sample-and-
hold circuits (Figure 2). The inputs must be driven differ-
entially around a common mode voltage set by the VCM
output pin, which is nominally 0.435 VDD. For the 1.32V
input range, the inputs should swing from VCM – 0.33V to
VCM + 0.33V. There should be 180° phase difference
between the inputs.
The two channels are simultaneously sampled by a
shared encode circuit.
INPUT DRIVE CIRCUITS
Input Filtering
If possible, there should be an RC lowpass filter right at
the analog inputs. This lowpass filter isolates the drive
circuitryfromtheA/Dsample-and-holdswitching,andalso
limits wide band noise from the drive circuitry. Figure 3
shows an example of an input RC filter. The RC compo-
nent values should be chosen based on the application’s
specific input frequency.
Transformer-Coupled Circuits
Figure 3 shows the analog input being driven by an RF
transformer with the common mode supplied through a
pair of resistors via the VCM pin.
At higher input frequencies a transmission line balun
transformer (Figures 4 and 5) has better balance, resulting
in lower A/D distortion.
2pF
RON
20
RON
20
VDD
LTC2158-14
AIN+
215814 F02
2pF
VDD
AIN–
ENC
ENC+
2pF
1.2V
10k
25
4.7
10
0.1F
10pF
0.1F
LTC2158-14
IN
0.1F
T1: MACOM ETC1-1T
215814 F03
AIN+
AIN–
VCM
Figure 2. Equivalent Input Circuit. Only One
of Two Analog Channels Is Shown
Figure 3. Analog Input Circuit Using a Transformer.
Recommended for Input Frequencies from 5MHz to 70MHz
applicaTions inForMaTion
Figure 4. Recommended Front-End Circuit for
Input Frequencies from 15MHz to 150MHz
45
10
4.7
0.1F
100
IN
0.1F
T1: MABA
007159-000000
T2: WBC1-1L
215814 F04
LTC2158-14
AIN+
AIN–
VCM
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