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参数资料
| 型号： | LTC2351HUH-12#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | ADC |
| 英文描述： | 6-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQCC32 |
| 封装： | 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD, QFN-32 |
| 文件页数： | 8/20页 |
| 文件大小： | 224K |
| 代理商： | LTC2351HUH-12#PBF |
LTC2351-12
16
235112fa
INPUT VOLTAGE (V)
2'S
COMPLEMENT
OUTPUT
CODE
235112 F05
011...111
011...110
011...101
100...000
100...001
100...010
FS – 1LSB
–FS
INPUT VOLTAGE (V)
STRAIGHT
BINAR
Y
OUTPUT
CODE
235112 F04
111...111
111...110
111...101
000...000
000...001
000...010
FS – 1LSB
0
235112 F03
FREQUENCY (Hz)
–100
CMRR
(dB)
–60
–20
–40
–80
0
10k
100k
1M
10M 100M 1G
–120
100
1k
APPLICATIONS INFORMATION
Integral nonlinearity errors (INL) and differential nonlinear-
ity errors (DNL) are largely independent of the common
mode voltage. However, the offset error will vary. DC CMRR
is typically better than –90dB.
Figure 4 shows the ideal input/output characteristics for
the LTC2351-12 in unipolar mode (BIP = Low). The code
transitions occur midway between successive integer LSB
values (i.e., 0.5LSB, 1.5LSB, 2.5LSB, FS – 1.5LSB). The
output code is straight binary with 1LSB = 2.5V/4096 =
610μV for the LTC2351-12. The LTC2351-12 has 0.2 LSB
RMS of Gaussian white noise.
Figure 5 shows the ideal input/output characteristics for
the LTC2351-12 in bipolar mode (BIP = High). The code
transitions occur midway between successive integer LSB
values (i.e., 0.5LSB, 1.5LSB, 2.5LSB, FS – 1.5LSB). The
output code is 2’s complement with 1LSB = 2.5V/4096 =
610μV for the LTC2351-12. The LTC2351-12 has 0.2 LSB
RMS of Gaussian white noise.
POWER-DOWN MODES
Upon power-up, the LTC2351-12 is initialized to the
active state and is ready for conversion. The Nap and
Sleep mode waveforms show the power down modes
for the LTC2351-12. The SCK and CONV inputs control
the power down modes (see Timing Diagrams). Two ris-
ing edges at CONV, without any intervening rising edges
at SCK, put the LTC2351-12 in Nap mode and the power
consumption drops from 16.5mW to 4.5mW. The internal
reference remains powered in Nap mode. One or more
rising edges at SCK wake up the LTC2351-12 very quickly
and CONV can start an accurate conversion within a clock
cycle. Four rising edges at CONV, without any intervening
rising edges at SCK, put the LTC2351-12 in Sleep mode
and the power consumption drops from 16.5mW to 12μW.
One or more rising edges at SCK wake up the LTC2351-12
for operation. The internal reference (VREF ) takes 2ms to
slew and settle with a 10μF load. Using sleep mode more
frequently compromises the accuracy of the output data.
Note that for slower conversion rates, the Nap and Sleep
modes can be used for substantial reductions in power
consumption.
Figure 3. CMRR vs Frequency
Figure 5. LTC2351-12 Transfer Characteristic
in Bipolar Mode (BIP = High)
Figure 4. LTC2351-12 Transfer Characteristic
in Unipolar Mode (BIP = Low)
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