AD9245 Replacement: GX9245 Pin-to-Pin 14-Bit 80 MSPS ADC

GX9245 is developed for high-speed data acquisition systems requiring 14-bit resolution, parallel CMOS output and wide analog input bandwidth.

The device integrates a high-performance sample-and-hold amplifier, an on-chip voltage reference and a multistage differential pipeline ADC with digital error correction. It supports sampling rates up to 80 MSPS while providing no missing codes across the specified operating-temperature range.

GX9245 uses a QFN-32 package measuring 5 mm × 5 mm and provides pin-to-pin hardware compatibility with AD9245. For existing AD9245 systems operating within the GX9245 supply range, the original schematic, PCB footprint and parallel data-acquisition architecture can be retained after electrical and timing verification.

 

GX9245 as a Direct AD9245 Replacement

GX9245 is a single-channel, 14-bit pipelined ADC supporting conversion rates up to 80 MSPS. Its differential input architecture provides a 500 MHz analog input bandwidth and selectable input spans from 1 V p-p to 2 V p-p.

The device is suitable for replacing AD9245 in communication receivers, medical imaging equipment, portable instruments, oscilloscopes, spectrum analyzers and industrial data acquisition systems.

GX9245 can also be evaluated for new designs requiring a compact 14-bit ADC with parallel CMOS output, wide input bandwidth, low power consumption and extended operating-temperature capability.

 

Pin-to-Pin Hardware and CMOS Interface Compatibility with AD9245

GX9245 provides a pin-compatible QFN-32 hardware migration solution for the 32-lead AD9245 LFCSP package. Compatible analog inputs, reference connections, clock and control signals, output data pins and out-of-range indication allow the existing board architecture to be retained.

The 14-bit parallel CMOS output supports offset-binary and two’s-complement data formats. A single-ended clock input controls conversion, while the integrated duty-cycle stabilizer compensates for clock duty-cycle variation.

The converter uses pin-controlled operating modes rather than a serial configuration register interface. Migration therefore focuses on electrical levels and interface timing instead of register-map conversion. In validated configurations, existing FPGA, DSP or MCU data-capture logic can be retained.

GX9245 supports a 3.0 V to 3.6 V analog supply and 2.5 V or 3.3 V digital-output logic. Because AD9245 specifies an analog supply range beginning at 2.7 V, existing systems operating below 3.0 V must have their analog supply reviewed before replacement.

For systems already operating from a 3.0 V to 3.6 V analog supply, GX9245 can normally be installed without changing the schematic or PCB, subject to pinout, reference, clock, loading and timing verification.

 

GX9245 vs AD9245: Key Specification Comparison

Specification	AD9245	GX9245
Resolution	14-bit	14-bit
Channels	1	1
ADC Architecture	Pipelined ADC	Pipelined ADC
Maximum Sampling Rate	80 MSPS	80 MSPS
Input Type	Differential; Single-Ended Operation Supported	Differential; Single-Ended Operation Supported
Analog Input Bandwidth	500 MHz	500 MHz
Input Signal Range	1 V p-p to 2 V p-p	1 V p-p to 2 V p-p
Analog Supply Range	2.7–3.6 V	3.0–3.6 V
Typical Analog Supply	3.0 V	3.3 V
Digital Output Logic	2.5 V or 3.3 V	2.5 V or 3.3 V
Data Output Interface	14-Bit Parallel CMOS	14-Bit Parallel CMOS
Output Data Format	Offset Binary / Two’s Complement	Offset Binary / Two’s Complement
On-Chip Reference	Yes	Yes
Sample-and-Hold Amplifier	Integrated	Integrated
Duty-Cycle Stabilizer	Yes	Yes
Out-of-Range Output	Yes	Yes
Typical Power at 80 MSPS	366 mW	210 mW
Operating Temperature Range	−40°C to +85°C	−55°C to +125°C
Package	32-Lead LFCSP, 5 mm × 5 mm	QFN-32, 5 mm × 5 mm
Pin-to-Pin Compatible	—	Yes
PCB Modification Required	—	Normally No for Verified 3.0–3.6 V Designs
Register-Map Migration Required	—	No Serial Register Interface

GX9245 retains the principal resolution, sampling-rate, input-bandwidth and parallel-output characteristics required by AD9245-based systems while providing lower typical power consumption and a wider specified operating-temperature range.

 

High-Speed Conversion Features and Applications

Key GX9245 features include:

l Single-channel 14-bit pipelined ADC

l Sampling rate up to 80 MSPS

l 500 MHz analog input bandwidth

l Differential input with single-ended operation support

l Selectable 1 V p-p to 2 V p-p input range

l Integrated sample-and-hold amplifier

l Integrated voltage reference

l Multistage pipeline architecture with digital error correction

l 14-bit parallel CMOS output

l Offset-binary and two’s-complement output formats

l Single-ended clock input

l Integrated duty-cycle stabilizer

l Out-of-range indication

l Typical power consumption of 210 mW at 80 MSPS

l −55°C to +125°C operating-temperature range

l Compact 5 mm × 5 mm QFN-32 package

GX9245 is suitable for:

l Medical imaging and ultrasound equipment

l IF sampling in communication receivers

l Battery-powered and portable instruments

l Handheld oscilloscopes and scopemeters

l Spectrum analyzers

l Industrial data acquisition systems

l Test and measurement equipment

l Wide-temperature electronic systems

 

Supply, Compatibility Verification and Technical Support

GXSC can provide samples and technical support for AD9245 replacement projects and new high-speed data acquisition designs.

Before approving a direct replacement, engineers should verify:

l Complete AD9245 ordering code and speed grade

l Analog supply voltage

l Digital output driver voltage

l QFN-32 and LFCSP-32 pin correspondence

l Analog input common-mode voltage and input span

l Internal or external reference configuration

l Clock frequency, duty cycle and jitter

l CMOS output loading and interface timing

l Output data format and MODE-pin configuration

l Power-down control

l Operating-temperature requirements

 

For validated systems using a compatible supply, pinout and timing configuration, GX9245 can retain the existing schematic, PCB and digital data-capture architecture.

 

Request the GX9245 Datasheet, Samples and Technical Support

Contact GXSC to request the GX9245 datasheet, QFN-32 pinout information, samples, quotation or technical support.

For AD9245 replacement evaluation, please provide the complete AD9245 ordering code, existing supply voltages, sampling rate, input configuration, reference circuit, clock conditions and processor or FPGA interface information.