參數(shù)資料
型號(hào)： TMC1185
廠商： Fairchild Semiconductor Corporation
英文描述： 10-Bit, 40 Msps Sampling Analog-to-Digital Converter(10位,采樣速率40Msps,A/D轉(zhuǎn)換器)
中文描述： 10位，40 Msps的采樣模擬到數(shù)字轉(zhuǎn)換器（10位，40Msps采樣速率，的A / D轉(zhuǎn)換器）
文件頁(yè)數(shù)： 15/20頁(yè)
文件大小： 191K
代理商： TMC1185
PRODUCT SPECIFICATION
TMC1185
15
For the differential configuration, the full scale input range
will be set to the external reference values that are selected.
For the single-ended mode, the input range is 2 (REFT
EXT
– REFB
EXT
), with the common-mode being centered at
(REFT
EXT
+ REFB
EXT
)/2. Refer to the typical performance
curves for expected performance vs. full scale input range.
The circuit in Figure 10 works completely on a single +5V
supply. As a reference element, it uses the micro-power
reference REF1004-2.5, which is set to a quiescent current of
0.1mA. Amplifier A
2
is configured as a follower to buffer the
+1.25V generated from the resistor divider. To provide the
necessary current drive, a pull-down resistor, R
P
is added.
Amplifier A
1
is configured as an adjustable gain stage, with a
range of approximately 1 to 1.32. The pull-up resistor again
relieves the op amp from providing the full current drive.
The value of the pull-up/down resistors is not critical and can
be varied to optimize power consumption. The need for
pull-up/down resistors depends only on the drive capability
of the selected drive amplifier and thus can be omitted.
PC Board Layout and Bypassing
A well-designed, clean PC board layout will assure proper
operation and clean spectral response. Proper grounding and
bypassing, short lead lengths, and the use of ground planes
are particularly important for high frequency circuits.
Multilayer PC boards are recommended for best perfor-
mance but if carefully designed, a two-sided PC board with
large, heavy ground planes can give excellent results. It is
recommended that the analog and digital ground pins of the
TMC1185 be connected directly to the analog ground plane.
In our experience, this gives the most consistent results.
The A/D power supply commons should be tied together at
the analog ground plane. Power supplies should be bypassed
with 0.1
m
F ceramic capacitors as close to the pin as
possible.
Dynamic Performance Testing
The TMC1185 is a high performance converter and careful
attention to test techniques is necessary to achieve accurate
results. Highly accurate phase-locked signal sources allow
high resolution FFT measurements to be made without using
data windowing functions. A low jitter signal generator such
as the HP8644A for the test signal, phase-locked with a low
jitter HP8022A pulse generator for the A/D clock, gives
excellent results. Low pass filtering (or bandpass filtering) of
test signals is absolutely necessary to test the low distortion
of the TMC1185. Using a signal amplitude slightly lower
than full scale will allow a small amount of “headroom” so
that noise or DC offset voltage will not overrange the A/D
and cause clipping on signal peaks.
Figure 10. Optional External Reference to Set the Full-Scale Range Utilizing a Dual, Single-Supply Op Amp
2k
W
+2.5V to +3.25V
+5V
+5V
R
220
W
R
220
W
10k
W
6.2k
W
0.1
m
F
+2.5V
10k
W
1/2
OPA2234
1/2
OPA2234
A
1
A
2
Bottom
Reference
65-1185-17
Top
Reference
REF1004
+1.25V
10k
W
10k
W
*
10k
W
*
NOTE: (*) Use parts alternatively for adjustment capability.
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TMC1203 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Triple Video A/D Converter
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TMC1203KLC40 功能描述:視頻模擬/數(shù)字化轉(zhuǎn)換器集成電路 Video a/D Converter Tripple 8Bit 4MSPS RoHS:否 制造商:Texas Instruments 輸入信號(hào)類(lèi)型:Differential 轉(zhuǎn)換器數(shù)量:1 ADC 輸入端數(shù)量:4 轉(zhuǎn)換速率:3 Gbps 分辨率:8 bit 結(jié)構(gòu): 輸入電壓:3.3 V 接口類(lèi)型:SPI 信噪比: 電壓參考: 電源電壓-最大:3.45 V 電源電壓-最小:3.15 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TCSP-48 封裝:Reel
TMC1203KLC40_Q 功能描述:視頻模擬/數(shù)字化轉(zhuǎn)換器集成電路 Video a/D Converter Tripple 8Bit 4MSPS RoHS:否 制造商:Texas Instruments 輸入信號(hào)類(lèi)型:Differential 轉(zhuǎn)換器數(shù)量:1 ADC 輸入端數(shù)量:4 轉(zhuǎn)換速率:3 Gbps 分辨率:8 bit 結(jié)構(gòu): 輸入電壓:3.3 V 接口類(lèi)型:SPI 信噪比: 電壓參考: 電源電壓-最大:3.45 V 電源電壓-最小:3.15 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TCSP-48 封裝:Reel
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