参数资料
型号: AD9235BRUZRL7-40
厂商: Analog Devices Inc
文件页数: 1/40页
文件大小: 0K
描述: IC ADC 12BIT SGL 40MSPS 28TSSOP
标准包装: 1,000
位数: 12
采样率(每秒): 40M
数据接口: 并联
转换器数目: 3
功率耗散(最大): 165mW
电压电源: 单电源
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 28-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 28-TSSOP
包装: 带卷 (TR)
输入数目和类型: 2 个单端,单极;1 个差分,单极
12-Bit, 20/40/65 MSPS
3 V A/D Converter
Data Sheet
Rev. D
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2012 Analog Devices, Inc. All rights reserved.
FEATURES
Single 3 V supply operation (2.7 V to 3.6 V)
SNR = 70 dBc to Nyquist at 65 MSPS
SFDR = 85 dBc to Nyquist at 65 MSPS
Low power: 300 mW at 65 MSPS
Differential input with 500 MHz bandwidth
On-chip reference and SHA
DNL = ±0.4 LSB
Flexible analog input: 1 V p-p to 2 V p-p range
Offset binary or twos complement data format
Clock duty cycle stabilizer
APPLICATIONS
Ultrasound equipment
IF sampling in communications receivers
IS-95, CDMA-One, IMT-2000
Battery-powered instruments
Hand-held scopemeters
Low cost digital oscilloscopes
FUNCTIONAL BLOCK DIAGRAM
SHA
VIN+
VIN–
DRVDD
8-STAGE
1 1/2-BIT
PIPELINE
CLK
PDWN
MODE
CLOCK
DUTY CYCLE
STABILIZER
MODE
SELECT
DGND
OTR
D11
D0
AVDD
MDAC1
CORRECTION LOGIC
OUTPUT BUFFERS
REF
SELECT
AGND
0.5V
VREF
SENSE
AD9235
02461-001
REFT
REFB
A/D
4
16
12
3
Figure 1.
GENERAL DESCRIPTION
The AD9235 is a family of monolithic, single 3 V supply, 12-bit,
20/40/65 MSPS analog-to-digital converters (ADCs). This
family features a high performance sample-and-hold amplifier
(SHA) and voltage reference. The AD9235 uses a multistage
differential pipelined architecture with output error correction
logic to provide 12-bit accuracy at 20/40/65 MSPS data rates
and guarantee no missing codes over the full operating
temperature range.
The wide bandwidth, truly differential SHA allows a variety of
user-selectable input ranges and offsets including single-ended
applications. It is suitable for multiplexed systems that switch
full-scale voltage levels in successive channels and for sampling
single-channel inputs at frequencies well beyond the Nyquist rate.
Combined with power and cost savings over previously available
ADCs, the AD9235 is suitable for applications in communica-
tions, imaging, and medical ultrasound.
A single-ended clock input is used to control all internal
conversion cycles. A duty cycle stabilizer (DCS) compensates
for wide variations in the clock duty cycle while maintaining
excellent overall ADC performance. The digital output data is
presented in straight binary or twos complement formats. An
out-of-range (OTR) signal indicates an overflow condition that
can be used with the most significant bit to determine low or
high overflow.
Fabricated on an advanced CMOS process, the AD9235 is avail-
able in a 28-lead TSSOP and a 32-lead LFCSP and is specified
over the industrial temperature range (–40°C to +85°C).
PRODUCT HIGHLIGHTS
1. The AD9235 operates from a single 3 V power supply and
features a separate digital output driver supply to accommo-
date 2.5 V and 3.3 V logic families.
2. Operating at 65 MSPS, the AD9235 consumes a low 300 mW.
3. The patented SHA input maintains excellent performance for
input frequencies up to 100 MHz and can be configured for
single-ended or differential operation.
4. The AD9235 pinout is similar to the AD9214-65, a 10-bit,
65 MSPS ADC. This allows a simplified upgrade path from
10 bits to 12 bits for 65 MSPS systems.
5. The clock DCS maintains overall ADC performance over a
wide range of clock pulse widths.
6. The OTR output bit indicates when the signal is beyond the
selected input range.
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