Differential Inputs, 1 MSPS/500 kSPS, Dual
Simultaneous Sampling SAR ADCs
Data Sheet
AD4680/AD4681
FEATURES
GENERAL DESCRIPTION
16-bit ADC family
The AD4680/AD4681 are 16-bit, pin-compatible, dual simultane-
ous sampling, high speed, low power, successive approximation
register (SAR) analog-to-digital converters (ADCs) that operate
from a 3.0 V to 3.6 V power supply and feature throughput rates
of 1 MSPS for the AD4680 and 500 kSPS for the AD4681. The
analog input type is differential, accepts a wide common-mode
input voltage, and is sampled and converted on the falling edge
Dual simultaneous sampling
Fully differential analog inputs
Throughput conversion rate
1 MSPS for AD4680
500 kSPS for AD4681
SNR (typical)
92.5 dB, VREF = 3.3 V external
100 dB with 8× OSR, RES = 1
On-chip oversampling function
Resolution boost function
INL (maximum) 1.5 LSBs
2.5 V internal reference at 10 ppm/°C
High speed serial interface
−40°C to +125°C operation
3 mm × 3 mm, 16-lead LFCSP
Wide common-mode range
Alert function
CS
of . Integrated on-chip oversampling blocks improve dynamic
range and reduce noise at lower bandwidths. A buffered internal
2.5 V reference is included. Alternatively, an external reference
up to 3.3 V can be used.
The conversion process and data acquisition use standard control
inputs, allowing easy interfacing to microprocessors or digital
signal processors (DSPs). The device is compatible with 1.8 V,
2.5 V, and 3.3 V interfaces using a separate logic supply. The
AD4680/AD4681 are available in a 16-lead lead frame chip scale
package (LFCSP) with operation specified from −40°C to +125°C.
COMPANION PRODUCTS
APPLICATIONS
ADC Drivers: ADA4896-2, ADA4940-2, ADA4807-2, LTC6227
Voltage References: ADR4533, ADR4525
Low Dropout Regulators: ADP166, ADP7104, ADP7182
Additional companion products on the AD4680 and AD4681
product pages
Motor control position feedback
Motor control current sense
Sonar
Power quality
Data acquisition systems
Erbium doped fiber amplifier (EDFA) applications
Inphase (I) and quadrature (Q) demodulation
Table 1. Related Products
Input Type
16-Bit
14-Bit
12-Bit
Differential
Pseudo Differential
Single-Ended
AD7380
AD7383
AD7386
AD7381
AD7384
AD7387
AD7388
FUNCTIONAL BLOCK DIAGRAM
3.3V
3.3V
1µF
1µF
(
A
A+ AND A A–)
IN IN
V
V
LOGIC
CC
VREF
C1
C2
C1
A
A
A+
A–
R
R
IN
0V
OVER-
ADC A
SDOA
SAMPLING
IN
VREF
0V
REFIO
OSC
REFCAP
GND
SCLK
SDI
REF
LDO
DIGITAL
CONTROLLER
CONTROL
LOGIC
(
A
B+ AND A B–)
IN IN
REGCAP
CS
VREF
0V
R
R
C1
C2
C1
A
B+
IN
IN
OVER-
SAMPLING
ADC B
SDOB/ALERT
A
B–
VREF
0V
AD4680/AD4681
GND
Figure 1.
Rev. 0
Document Feedback
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rights of third parties that may result from its use. Specifications subject to change without notice.
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Devices. Trademarks and registeredtrademarks are the property of their respective owners.
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Technical Support
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www.analog.com
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