LTC2351HUH-12#PBF Linear Technology, LTC2351HUH-12#PBF Datasheet - Page 16

• Manufacturer Part Number: LTC2351HUH-12#PBF
• Description: IC ADC 12BIT 1.5MSPS 32-QFN
• Manufacturer: Linear Technology

Specifications of LTC2351HUH-12#PBF

• Number Of Bits: 12
• Sampling Rate (per Second): 1.5M
• Data Interface: Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 16.5mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-WFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS INFORMATION
LTC2351-12
16
111...111
111...110
111...101
000...010
000...001
000...000
011...111
011...110
011...101
100...010
100...001
100...000
Figure 4. LTC2351-12 Transfer Characteristic
in Unipolar Mode (BIP = Low)
Figure 5. LTC2351-12 Transfer Characteristic
in Bipolar Mode (BIP = High)
–120
–100
–20
–40
–60
–80
0
–FS
100
0
Figure 3. CMRR vs Frequency
1k
10k 100k
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
FREQUENCY (Hz)
1M
10M 100M 1G
FS – 1LSB
FS – 1LSB
235112 F04
235112 F05
235112 F03
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 (V
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.
REF
) takes 2ms to
235112fa