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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)： | 14/20頁(yè) |
| 文件大?。?/td> | 191K |
| 代理商： | TMC1185 |
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TMC1185
PRODUCT SPECIFICATION
14
and bottom reference (+2.25V), it is not necessary to do so.
In all cases the center point, V
CM
, should be bypassed to
ground in order to provide a low impedance AC ground.
If the signal needs to be DC coupled to the input of the
TMC1185, an operational amplifier input circuit is required.
In the differential input mode, any single-ended signal
must be modified to create a differential signal. This can be
accomplished by using two operational amplifiers, one in the
noninverting mode for the input and the other amplifier in the
inverting mode for the complementary input. The low
distortion circuit in Figure 7 will provide the necessary input
shifting required for signals centered around ground. It also
employs a diode for output level shifting to guarantee a low
distortion +3.25V output swing. Another DC-coupled circuit
is shown in Figure 8. Other amplifiers can be used in place of
the OPA642s if the lowest distortion is not necessary. If out-
put level shifting circuits are not used, care must be taken to
select operational amplifiers that give the necessary perfor-
mance when swinging to +3.25V with a
±
5V supply opera-
tional amplifier. The OPA620 and OPA621, or the lower
power OPA650 or OPA651 can be used in place of the
OPA642s in Figure 7. In that configuration, the OPA650 and
OPA651 will typically swing to within 100mV of positive
full scale. If the OPA621 or OPA651 is used, the input buffer
must be configured in a gain of 2.
The TMC1185 can also be configured with a single-ended
input full scale range of +0.25V to +4.25V by tying the
complementary input to the common-mode reference
voltage as shown in Figure 9. This configuration will result
in increased even-order harmonics, especially at higher input
frequencies. However, this tradeoff may be quite acceptable
for time-domain applications. The driving amplifier must
give adequate performance with a +0.25V to +4.25V output
swing in this case.
Figure 9. Single-Ended Input Connection
External References and Adjustment of
Fullscale Range
The internal reference buffers are limited to approximately
1mA of output current. As a result, these internal +1.25V and
+3.25V references may be overridden by external references
that have at least 25mA of output drive capability. In this
instance, the common-mode voltage will be set halfway
between the two references. This feature can be used to
adjust the gain error, improve gain drift, or to change the full
scale input range of the TMC1185. Changing the full scale
range to a lower value has the benefit of easing the swing
requirements of external input amplifiers. The external
references can vary as long as the value of the external top
reference (REFT
EXT
) is less than or equal to +3.4V and the
value of the external bottom reference (REFB
EXT
) is greater
than or equal to +1.1V and the difference between the
external references are greater than or equal to 800mV.
22
26
27
CM
IN
IN
TMC1185
0.1
μ
F
Single-Ended
Input Signal
Full Scale = +0.25V to +4.25V with internal references.
22pF
65-1185-16
Figure 8. A Wideband DC-Coupled,
Single-Ended to Differential Input Driver Circuit
50
W
1k
W
OTA
OPA660
OPA660
200
W
+1
+1
OPA131
1nF
OTA
–5V
+5V
DC-Coupled
Input Signal
27 IN
22 CM
26 IN
TMC1185
NOTE: Power supplies and bypassing not shown. The measured SNR performance with 12.5MHz input
signal is 57dB with this driver circuit.
1k
W
500
W
500
W
1k
W
243
W
200
W
3
B
2
3
6
2
8
5
C
6
6
1
8
5
C
E
E
3
2
B
200
W
C
15pF
22pF
65-1185-15
22pF
0.1
μ
F
2k
W
V
OUT
–5V
243
W
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TMC1200A | 制造商:TOPSTEK 制造商全稱:TOPSTEK 功能描述:Topstek Current Transducer |
| TMC1203 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Triple Video A/D Converter |
| TMC1203KLC20 | 功能描述:視頻模擬/數(shù)字化轉(zhuǎn)換器集成電路 RoHS:否 制造商:Texas Instruments 輸入信號(hào)類型: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 | 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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