LTC1867AIGN#TRPBF Linear Technology, LTC1867AIGN#TRPBF Datasheet - Page 12

• Manufacturer Part Number: LTC1867AIGN#TRPBF
• Description: IC ADC 16BIT 8CH 200KSPS 16SSOP
• Manufacturer: Linear Technology

Specifications of LTC1867AIGN#TRPBF

• Number Of Bits: 16
• Sampling Rate (per Second): 200k
• Data Interface: MICROWIRE™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 9mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP (0.150", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LTC1863/LTC1867
APPLICATIONS INFORMATION
where V
frequency and V
second through Nth harmonics.
Internal Reference
The LTC1863/LTC1867 has an on-chip, temperature
compensated, curvature corrected, bandgap reference
that is factory trimmed to 2.5V. It is internally connected
to a reference amplifi er and is available at V
A 6k resistor is in series with the output so that it can be
easily overdriven by an external reference if better drift
and/or accuracy are required as shown in Figure 4. The
reference amplifi er gains the V
4.096V at REFCOMP (Pin 9). This reference amplifi er
compensation pin, REFCOMP, must be bypassed with a
10μF ceramic or tantalum in parallel with a 0.1μF ceramic
for best noise performance.
12
2.5V
4.096V
Figure 4b. Using the LT1019-2.5 as an External Reference
1
2.2μF
10μF
LT1019A-2.5
is the RMS amplitude of the fundamental
10
15
Figure 4a. LT1867 Reference Circuit
9
V
5V
IN
V
REFCOMP
GND
V
REF
2
OUT
+
through V
10μF
R3
REFERENCE
N
R2
AMP
2.2μF
0.1μF
are the amplitudes of the
REF
10
15
9
V
voltage by 1.638V to
REFCOMP
GND
REF
LTC1863/
LTC1867
R1
6k
LTC1863/LTC1867
REFERENCE
REF
BANDGAP
1867 F04b
(Pin 10).
1867 F04a
Digital Interface
The LTC1863/LTC1867 have very simple digital interface
that is enabled by the control input, CS/CONV. A logic
rising edge applied to the CS/CONV input will initiate a
conversion. After the conversion, taking CS/CONV low will
enable the serial port and the ADC will present digital data
in two’s complement format in bipolar mode or straight
binary format in unipolar mode, through the SCK/SDO
serial port.
Internal Clock
The internal clock is factory trimmed to achieve a typical
conversion time of 3μs and a maximum conversion time,
3.5μs, over the full operating temperature range. The typi-
cal acquisition time is 1.1μs, and a throughput sampling
rate of 200ksps is tested and guaranteed.
Automatic Nap Mode
The LTC1863/LTC1867 go into automatic nap mode when
CS/CONV is held high after the conversion is complete.
With a typical operating current of 1.3mA and automatic
150μA nap mode between conversions, the power dis-
sipation drops with reduced sample rate. The ADC only
keeps the V
the part is in the automatic nap mode. The slower the
sample rate allows the power dissipation to be lower (see
Figure 5).
REF
2.0
1.5
1.0
0.5
Figure 5. Supply Current vs f
0
1
V
and REFCOMP voltages active when
DD
= 5V
10
f
SAMPLE
(ksps)
100
SAMPLE
18637 G10
1000
18637fa