LTC1403AIMSE Linear Technology, LTC1403AIMSE Datasheet - Page 11

• Manufacturer Part Number: LTC1403AIMSE
• Description: IC ADC 14BIT 2.8MSPS DIFF 10MSOP
• Manufacturer: Linear Technology

Specifications of LTC1403AIMSE

• Number Of Bits: 14
• Sampling Rate (per Second): 2.8M
• Data Interface: Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 12mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

INPUT SPAN VERSUS REFERENCE VOLTAGE
The differential input range has a unipolar voltage span that
equals the difference between the voltage at the reference
buffer output V
(Exposed Pad Ground). The differential input range of
the ADC is 0V to 2.5V when using the internal reference.
The internal ADC is referenced to these two nodes. This
relationship also holds true with an external reference.
DIFFERENTIAL INPUTS
The LTC1403/LTC1403A has a unique differential sample-
and-hold circuit that allows inputs from ground to V
The ADC will always convert the unipolar difference of
A
APPLICATIONS INFORMATION
IN
+
– A
IN
–
–100
–120
, independent of the common mode voltage
–20
–40
–60
–80
0
100
REF
at Pin 3, and the voltage at the ground
1k
CMRR vs Frequency
10k
FREQUENCY (Hz)
Figure 3
100k
1M
10M 100M
1403A F03
DD
.
at the inputs. The common mode rejection holds up at
extremely high frequencies, see Figure 3. The only require-
ment is that both inputs not go below ground or exceed
V
nonlinearity errors (DNL) are largely independent of the
common mode voltage. However, the offset error will vary.
The change in offset error is typically less than 0.1% of
the common mode voltage.
Figure 4 shows the ideal input/output characteristics for
the LTC1403/LTC1403A. The code transitions occur mid-
way between successive integer LSB values (i.e., 0.5LSB,
1.5LSB, 2.5LSB, FS – 1.5LSB). The output code is natural
binary with 1LSB = 2.5V/16384 = 153μV for the LTC1403A,
and 1LSB = 2.5V/4096 = 610μV for the LTC1403. The
LTC1403A has 1LSB RMS of random white noise.
DD
. Integral nonlinearity errors (INL) and differential
111...111
111...110
111...101
000...010
000...001
000...000
0
LTC1403/LTC1403A
LTC1403/LTC1403A Transfer
Figure 4
INPUT VOLTAGE (V)
Characteristic
FS – 1LSB
1403A F05
11
1403fb