- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375265 > ADS802U 12-Bit, 10MHz Sampling ANALOG-TO-DIGITAL CONVERTER PDF資料下載
參數(shù)資料
| 型號(hào)： | ADS802U |
| 英文描述： | 12-Bit, 10MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 12位，10MHz的采樣模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 12/13頁(yè) |
| 文件大?。?/td> | 283K |
| 代理商： | ADS802U |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)當(dāng)前第12頁(yè)第13頁(yè)
12
ADS802
FIGURE 6. A Low Distortion DC-Coupled, Single-Ended to Differential Input Driver Circuit.
FIGURE 7. Single-Ended Input Connection.
22
26
27
CM
IN
IN
ADS801
0.1μF
Single-Ended
Input Signal
Full Scale = +0.25V to +4.25V with internal references.
22pF
EXTERNAL REFERENCES AND ADJUSTMENT OF
FULL SCALE 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 refer-
ences that have at least 18mA (at room temperature) 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 ADS801.
Changing the full scale range to a lower value has the benefit
of easing the swing requirements of external input amplifi-
ers. 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 differ-
ence between the external references are greater than or
equal to 1.5V.
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 8 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 capa-
bility of the selected drive amplifiers 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. Mul-
tilayer PC boards are recommended for best performance
but if carefully designed, a two-sided PC board with large,
heavy ground planes can give excellent results. It is recom-
mended that the analog and digital ground pins of the
ADS801 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
μ
F ceramic capacitors as close to the pin as possible.
604
301
301
301
604
49.9
301
604
2.49k
2.49k
+2.25V
OPA642
OPA130
301
0.1μF
OPA642
OPA642
+5V
–5V
+5V
(2)
+5V
–5V
+5V
+5V
+5V
–5V
BAS16
(1)
BAS16
(1)
301
24.9
Input Level
Shift Buffer
Optional
High Impedance
Input Amplifier
DC-Coupled
Input Signal
26 IN
22 CM
27 IN
ADS801
NOTES: (1) A Philips BAS16 diode or equivalent
may be used. (2) Supply bypassing not shown.
22pF
22pF
604
0.1μF
0.1μF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS803E | 12-Bit, 5MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS803U | REC3-SR_DR/H1 Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 12V; Power: 3W; Low Cost 3W converter in DIP24 Package; 1kVDC Isolation; Regulated Output; UL Approved; Continuous Short Circuit Protection; Internal SMD design; 3 Pinout Options, 3 Case Styles.; Efficiency to 75% |
| ADS804 | 12-Bit, 10MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS804E | 12-Bit, 10MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS804U | 12-Bit, 10MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS802U/1K | 制造商:BB 制造商全稱:BB 功能描述:12-Bit, 10MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS802UG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 10 MSPS SE/Diff input RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS803 | 制造商:BB 制造商全稱:BB 功能描述:12-Bit, 5MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS803E | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 5 MSPS Int/Ext Ref RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS803E | 制造商:Texas Instruments 功能描述:IC 12BIT ADC SMD SSOP28 803 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。