LT6203 LINER [Linear Technology], LT6203 Datasheet - Page 10

• Manufacturer Part Number: LT6203
• Description: 16-Bit, 2Msps, Pseudo-Differential Unipolar SAR
• Manufacturer: LINER [Linear Technology]

APPLICATIONS INFORMATION
LTC2370-16
OVERVIEW
The LTC2370-16 is a low noise, low power, high speed 16-bit
successive approximation register (SAR) ADC. Operating
from a single 2.5V supply, the LTC2370-16 supports a
0V to V
V
performance applications which require a wide dynamic
range. The LTC2370-16 achieves ±0.85LSB INL max, no
missing codes at 16 bits and 94dB SNR.
Fast 2Msps throughput with no cycle latency makes the
LTC2370-16 ideally suited for a wide variety of high speed
applications. An internal oscillator sets the conversion time,
easing external timing considerations. The LTC2370-16
dissipates only 19mW at 2Msps, while an auto power-down
feature is provided to further reduce power dissipation
during inactive periods.
CONVERTER OPERATION
The LTC2370-16 operates in two phases. During the ac-
quisition phase, the charge redistribution capacitor D/A
converter (CDAC) is connected to the IN
sample the pseudo-differential analog input voltage. A ris-
ing edge on the CNV pin initiates a conversion. During the
conversion phase, the 16-bit CDAC is sequenced through a
successive approximation algorithm, effectively comparing
the sampled input with binary-weighted fractions of the
reference voltage (e.g. V
the differential comparator. At the end of conversion, the
CDAC output approximates the sampled analog input. The
ADC control logic then prepares the 16-bit digital output
code for serial transfer.
TRANSFER FUNCTION
The LTC2370-16 digitizes the full-scale voltage of REF
into 2
REF = 5V. The ideal transfer function is shown in Figure 2.
The output data is in straight binary format.
10
REF
ranging from 2.5V to 5.1V, making it ideal for high
16
REF
levels, resulting in an LSB size of 76µV with
pseudo-differential unipolar input range with
REF
/2, V
REF
/4 … V
+
REF
and IN
/65536) using
–
pins to
ANALOG INPUT
The analog inputs of the LTC2370-16 are pseudo-differential
in order to reduce any unwanted signal that is common
to both inputs. The analog inputs can be modeled by the
equivalent circuit shown in Figure 3. The diodes at the input
provide ESD protection. In the acquisition phase, each
input sees approximately 45pF (C
CDAC in series with 40Ω (R
of the sampling switch. The IN
spike while charging the C
During conversion, the analog inputs draw only a small
leakage current.
111...111
111...110
111...101
111...100
000...011
000...010
000...001
000...000
Figure 3. The Equivalent Circuit for the
Differential Analog Input of the LTC2370-16
IN
IN
Figure 2. LTC2370-16 Transfer Function
+
–
0V
1LSB = FS/65536
UNIPOLAR
ZERO
LSB
REF
REF
1
INPUT VOLTAGE (V)
R
40
R
40
IN
ON
ON
capacitor during acquisition.
ON
45pF
45pF
) from the on-resistance
C
C
+
IN
IN
input draws a current
IN
) from the sampling
FS – 1LSB
237016 F03
237016 F02
BIAS
VOLTAGE
237016fa