参数资料
型号: LTC2232IUK#TR
厂商: Linear Technology
文件页数: 14/28页
文件大小: 0K
描述: IC ADC 10BIT 105MSPS SAMPL 48QFN
标准包装: 2,000
位数: 10
采样率(每秒): 105M
数据接口: 并联
转换器数目: 1
功率耗散(最大): 535mW
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: 48-WFQFN 裸露焊盘
供应商设备封装: 48-QFN-EP(7x7)
包装: 带卷 (TR)
输入数目和类型: 1 个单端,双极; 1 个差分,双极
LTC2232/LTC2233
21
22323fa
The lower limit of the LTC2232/LTC2233 sample rate is
determined by droop of the sample-and-hold circuits. The
pipelined architecture of this ADC relies on storing analog
signals on small valued capacitors. Junction leakage will
discharge the capacitors. The specified minimum operat-
ing frequency for the LTC2232/LTC2233 is 1Msps.
DIGITAL OUTPUTS
Table 1 shows the relationship between the analog input
voltage, the digital data bits and the overflow bit.
APPLICATIO S I FOR ATIO
WU
UU
Figure 12a. Single-Ended ENC Drive,
Not Recommended for Low Jitter
Digital Output Buffers
Figure 13 shows an equivalent circuit for a single output
buffer. Each buffer is powered by OVDD and OGND, iso-
lated from the ADC power and ground. The additional N-
channel transistor in the output driver allows operation
down to low voltages. The internal resistor in series with
the output makes the output appear as 50
to external
circuitry and may eliminate the need for external damping
resistors.
As with all high speed/high resolution converters, the
digital output loading can affect the performance. The
digital outputs of the LTC2232/LTC2233 should drive a
minimal capacitive load to avoid possible interaction be-
tween the digital outputs and sensitive input circuitry. The
output should be buffered with a device such as an
ALVCH16373 CMOS latch. For full speed operation the
capacitive load should be kept under 10pF.
Lower OVDD voltages will also help reduce interference
from the digital outputs.
Figure 12b. ENC Drive Using a CMOS to PECL Translator
22323 F12a
ENC
1.6V
VTHRESHOLD = 1.6V
ENC+
0.1
F
LTC2232/
LTC2233
22323 F12b
ENC
ENC+
130
3.3V
130
D0
Q0
MC100LVELT22
LTC2232/
LTC2233
83
83
Figure 13. Digital Output Buffer
LTC2232/LTC2233
22323 F13
OVDD
VDD
0.1
F
43
TYPICAL
DATA
OUTPUT
OGND
OVDD
0.5V
TO 3.6V
PREDRIVER
LOGIC
DATA
FROM
LATCH
OE
Table 1. Output Codes vs Input Voltage
AIN+ – AIN–
D9 – D0
(2V Range)
OF
(Offset Binary)
(2’s Complement)
>+1.000000V
1
11 1111 1111
01 1111 1111
+0.998047V
0
11 1111 1111
01 1111 1111
+0.996094V
0
11 1111 1110
01 1111 1110
+0.001953V
0
10 0000 0001
00 0000 0001
0.000000V
0
10 0000 0000
00 0000 0000
–0.001953V
0
01 1111 1111
11 1111 1111
–0.003906V
0
01 1111 1110
11 1111 1110
–0.998047V
0
00 0000 0001
10 0000 0001
–1.000000V
0
00 0000 0000
10 0000 0000
<–1.000000V
1
00 0000 0000
10 0000 0000
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