LTC1603CG Linear Technology, LTC1603CG Datasheet - Page 14

• Manufacturer Part Number: LTC1603CG
• Description: IC ADC W/SHUTDOWN 16BIT 36-SSOP
• Manufacturer: Linear Technology

Specifications of LTC1603CG

• Number Of Bits: 16
• Sampling Rate (per Second): 250k
• Data Interface: Parallel
• Number Of Converters: 1
• Power Dissipation (max): 350mW
• Voltage Supply Source: Analog and Digital, Dual ±
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 36-SSOP (0.200", 5.30mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIONS
LTC1603
can not exceed the AV
Integral nonlinearity errors (INL) and differential nonlin-
earity errors (DNL) are independent of the common mode
voltage, however, the bipolar zero error (BZE) will vary.
The change in BZE is typically less than 0.1% of the
common mode voltage. Dynamic performance is also
affected by the common mode voltage. THD will degrade
as the inputs approach either power supply rail, from 96dB
with a common mode of 0V to 86dB with a common mode
of 2.5V or – 2.5V.
Differential inputs allow greater flexibility for accepting
different input ranges. Figure 14b shows a circuit that
converts a 0V to 5V analog input signal with only an
additional buffer that is not in the signal path.
14
LTC1450
Figure 14a. CMRR vs Input Frequency
80
70
60
50
40
30
20
10
0
Figure 13. Driving V
1k
U
INPUT FREQUENCY (Hz)
DD
10k
ANALOG INPUT
DIFFERENTIAL
INFORMATION
U
or V
2V TO 2.7V
2V TO 2.7V
SS
47 F
REF
100k
power supply voltages.
with a DAC
W
1
2
3
4
5
A
A
V
REFCOMP
AGND
IN
IN
REF
1603 G14a
+
–
LTC1603
1M
U
1603 F13
Full-Scale and Offset Adjustment
Figure 15a shows the ideal input/output characteristics
for the LTC1603. The code transitions occur midway
between successive integer LSB values (i.e., – FS +
0.5LSB, – FS + 1.5LSB, – FS + 2.5LSB,... FS – 1.5LSB,
FS – 0.5LSB). The output is two’s complement binary with
1LSB = FS – (– FS)/65536 = 5V/65536 = 76.3 V.
In applications where absolute accuracy is important,
offset and full-scale errors can be adjusted to zero. Offset
error must be adjusted before full-scale error. Figure 15b
shows the extra components required for full-scale error
adjustment. Zero offset is achieved by adjusting the offset
applied to the A
Figure 14b. Selectable 0V to 5V or 2.5V Input Range
Figure 15a. LTC1603 Transfer Characteristics
011...111
011...110
000...001
000...000
111...111
111...110
100...001
100...000
2.5V
– (FS – 1LSB)
IN
0V TO
5V
–
ANALOG INPUT
INPUT VOLTAGE (A
input. For zero offset error apply
10 F
+
–
4
5
1
2
3
IN
A
A
V
REFCOMP
AGND
+
IN
IN
REF
– A
+
–
LTC1603
IN
–
FS – 1LSB
)
1603 F15a
1603 F14b
1603f