參數(shù)資料
型號： ADS62C17IRGCR
廠商： Texas Instruments
文件頁數(shù)： 42/68頁
文件大?。?/td> 0K
描述： IC ADC 11BIT SRL/PAR 200M 64VQFN
標(biāo)準(zhǔn)包裝： 2,000
位數(shù)： 11
采樣率（每秒）： 200M
數(shù)據(jù)接口： 串行，并聯(lián)
轉(zhuǎn)換器數(shù)目： 2
功率耗散（最大）： 1.1W
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-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 64-VQFN 裸露焊盤（9x9）
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 2 個(gè)差分，單極
INP
INM
VCM
1:4
5
0.1 F
5
100
25
15pF
72nH
Differential
input signal
Input common-mode
REFERENCE
_
+
_
+
INTERNAL
REFERENCE
INTREF
EXTREF
REFM
REFP
VCM
Internal reference
www.ti.com ............................................................................................................................................................. SLAS631A – APRIL 2009 – REVISED JULY 2009
All these examples show 1:1 transformers being used with a 50 ohms source. As explained in the "Drive Circuit
Requirements", this helps to present a low source impedance to absorb the sampling glitches. With a 1:4
transformer, the source impedance will be 200 ohms. The higher impedance can lead to degradation in
performance, compared to the case with 1:1 transformers. For applications where only a band of frequencies are
used, the drive circuit can be tuned to present a low impedance for the sampling glitches. Figure 49 shows an
example with 1:4 transformer, tuned for a band around 150MHz.
Figure 49. Drive circuit with 1:4 transformer
To ensure a low-noise common-mode reference, the VCM pin is filtered with a 0.1
F low-inductance capacitor
connected to ground. The VCM pin is designed to directly drive the ADC inputs. The input stage of the ADC
sinks a common-mode current in the order of 3.6
A / MSPS (about 720 A at 200 MSPS).
ADS62C17 has built-in internal references REFP and REFM, requiring no external components. Design schemes
are used to linearize the converter load seen by the references; this and the on-chip integration of the requisite
reference capacitors eliminates the need for external decoupling. The full-scale input range of the converter can
be controlled in the external reference mode as explained below. The internal or external reference modes can
be selected by programming the serial interface register bit <REF>.
Figure 50. Reference Section
When the device is in internal reference mode, the REFP and REFM voltages are generated internally.
Common-mode voltage (1.5V nominal) is output on VCM pin, which can be used to externally bias the analog
input pins
Copyright 2009, Texas Instruments Incorporated
47
Product Folder Link(s): ADS62C17
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