參數(shù)資料
型號(hào)： AD9260ASZRL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 30/44頁(yè)
文件大小： 0K
描述： IC ADC 16BIT 2.5MHZ 44MQFP
標(biāo)準(zhǔn)包裝： 800
位數(shù)： 16
采樣率（每秒）： 20M
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 585mW
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： 44-QFP
供應(yīng)商設(shè)備封裝： 44-MQFP（10x10）
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 2 個(gè)單端，單極；1 個(gè)差分，單極
AD9260
Rev. C | Page 36 of 44
EVALUATION BOARD GENERAL DESCRIPTION
The AD9260 Evaluation Board is designed to provide an easy
and flexible method of exercising the AD9260 and demonstrate
its performance to data sheet specifications. The evaluation
board is fabricated in four layers: the component layer, the
ground layer, the power layer, and the solder layer. The board is
clearly labeled to provide easy identification of components.
Ample space is provided near the analog and clock inputs to
provide additional or alternate signal conditioning.
FEATURES AND USER CONTROLS
Jumper Controlled Mode/OSR Selection
The choice of Mode/OSR can easily be varied by jumping either
JP1, JP2, JP3, or JP4 as illustrated in Figure 78 within the
Mode/OSR Control Block. To obtain the desired mode, refer to
Table 16. AD9260 Evaluation Board Mode Select
Mode/OSR
Connect Jumper
1×
JP4
2×
JP2
4×
JP3
8×
JP1
Selectable Power Bias
The power consumption of the AD9260 can be scaled down if
the user is able to operate the device at a lower clock frequency.
As illustrated in Figure 78, pin cups are provided for the
external resistor (R2) tied to the BIAS pin of the AD9260.
Table 17 defines the recommended resistance for a given clock
speed to obtain the desired power consumption.
Table 17. Evaluation Board Recommended Resistance Value
for External Bias Resistor
Resistor Value
Clock Speed (max)
Power Consumption
2 k
20 MHz
585 mW
4 k
10 MHz
325 mW
8 k
5 MHz
200 mW
16 k
2.5 MHz
150 mW
Data Interfacing Controls
The data interfacing controls (RESETB, CSB, READ, DAV) are
all accessible via SMA connectors (J2–J5) as illustrated in
Figure 78 within the data interfacing control block. The
RESETB, CSB, and READ connections are each supplied with
two sets or resistor pin cups to allow the user to pull-up or pull-
down each signal to a fixed state. R5, R6, and R30 will terminate
to ground, while R7, R28, and R29 terminate to DRVDD. The
DAV and OTR signals are also directly connected to the data
output connector P1. All interfacing controls are buffered
through the CMOS line driver 74HC541.
Buffered Output Data
The twos complement output data is buffered through two
CMOS noninverting bus transceivers (U2 and U3) and made
available at pin connector P1 as illustrated in Figure 78 within
the data output block.
Jumper Controlled Reference Source
The choice of reference for the AD9260 can easily be varied
between 1.0 V, 2.5 V or external by using jumpers JP5, JP6, JP7,
and JP9 as illustrated in Figure 78 within the reference
configuration block. To obtain the desired reference, see
AD817R
C15
0.1
F
C17
10
F
R11
49.9
JP10
R12
15k
R13
10k
R3
15k
R4
10k
R10
1k
VCC2
U6
C14
R8
390
R9
1k
Q1
2N2222
C12
C13
10
F
+
2.5/3V
NC
VOUT
TRIM
NC
+VIN
TEMP
GNDS
AD780R
U5
C18
0.1
F
0.1
F
0.1
F
0.1
F
C19
VCC2
1
2
3
4
8
7
6
5
AGND
VREFEXT
1KPOT
1V
+
00581-C-077
Figure 77. Evaluation Board External Reference Circuitry
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