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參數資料
| 型號： | AD9236BRU-80EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 12-Bit, 80 MSPS, 3V A/D Converter |
| 中文描述： | 12位，80 MSPS的，3V的A / D轉換 |
| 文件頁數： | 17/36頁 |
| 文件大小： | 2056K |
| 代理商： | AD9236BRU-80EB |
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AD9236
TIMING
The AD9236 provides latched data outputs with a pipeline delay
of seven clock cycles. Data outputs are available one propaga-
tion delay (t
PD
) after the rising edge of the clock signal. Refer to
for a detailed timing diagram.
Figure 2
The length of the output data lines and the loads placed on
them should be minimized to reduce transients within the
AD9236. These transients can degrade the converter’s dynamic
performance.
The lowest typical conversion rate of the AD9236 is 1 MSPS. At
clock rates below 1 MSPS, dynamic performance may degrade.
VOLTAGE REFERENCE
A stable and accurate 0.5 V voltage reference is built into the
AD9236. The input range can be adjusted by varying the refer-
ence voltage applied to the AD9236 using either the internal
reference or an externally applied reference voltage. The input
span of the ADC tracks reference voltage changes linearly. The
various reference modes are summarized in
described in the following sections.
and
Table 9
Table 9
Table 9. Reference Configuration Summary
Selected Mode
External Reference
Internal Fixed Reference
Programmable Reference
If the ADC is being driven differentially through a transformer,
the reference voltage can be used to bias the center tap (com-
mon-mode voltage).
INTERNAL REFERENCE CONNECTION
A comparator within the AD9236 detects the potential at the
SENSE pin and configures the reference into four possible
states, which are summarized in
the reference amplifier switch is connected to the internal resis-
tor divider (see
), setting VREF to 1 V. Connecting the
SENSE pin to VREF switches the reference amplifier output to
the SENSE pin, completing the loop and providing a 0.5 V ref-
erence output. If a resistor divider is connected as shown in
, the switch is again set to the SENSE pin. This puts the
reference amplifier in a noninverting mode with the VREF out-
put defined as follows:
. If SENSE is grounded,
Figure 33
Figure 33. Internal Reference Configuration
Figure 35
1
×
=
R1
R2
VREF
5
In all reference configurations, REFT and REFB drive the A/D
conversion core and establish its input span. The input range of
the ADC always equals twice the voltage at the reference pin for
either an internal or an external reference.
03066-A-017
10
μ
F+
0.1
μ
F
VREF
SENSE
0.5V
AD9236
VIN–
VIN+
REFT
0.1
μ
F
0.1
μ
F
10
μ
F
0.1
μ
F
REFB
SELECT
LOGIC
ADC
CORE
+
If the internal reference of the AD9236 is used to drive multiple
converters to improve gain matching, the loading of the refer-
ence by the other converters must be considered. F
depicts how the internal reference voltage is affected by loading.
igure 34
Figure 34. VREF Accuracy vs. Load
LOAD (mA)
E
0.05
0
0.5
1.0
1.5
2.0
2.5
3.0
03066-0-019
0
–0.25
–0.20
–0.15
–0.10
–0.05
0.5V ERROR (%)
1.0V ERROR (%)
SENSE Voltage
AVDD
VREF
0.2 V to VREF
Internal Switch
Position
N/A
SENSE
SENSE
Resulting VREF (V)
N/A
0.5
+
×
1
5
Resulting Differential
Span (V p-p)
2 × External Reference
1.0
2 × VREF
R1
R2
(See Figure 35)
Internal Fixed Reference
AGND to 0.2 V
Internal Divider
1.0
2.0
Rev. A | Page 17 of 36
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9236BRURL7-80 | 制造商:Analog Devices 功能描述:ADC Single Pipelined 80Msps 12-bit Parallel 28-Pin TSSOP T/R |
| AD9236BRUZ-80 | 功能描述:IC ADC 12BIT 80MSPS 28TSSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 其它有關文件:TSA1204 View All Specifications 標準包裝:1 系列:- 位數:12 采樣率（每秒）:20M 數據接口:并聯 轉換器數目:2 功率耗散（最大）:155mW 電壓電源:模擬和數字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應商設備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數目和類型:4 個單端，單極；2 個差分，單極 產品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD9236BRUZRL7-80 | 功能描述:IC ADC 12BIT 80MSPS 28TSSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
| AD9237 | 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Bit, 20 MSPS/40 MSPS/65 MSPS 3 V Low Power A/D Converter |
| AD9237BCP-20EB | 制造商:Analog Devices 功能描述:12 BIT 3V 20 MSPS LOW POWER ADC - Trays |
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