AD9042ASTZ Analog Devices Inc, AD9042ASTZ Datasheet - Page 21

• Manufacturer Part Number: AD9042ASTZ
• Description: IC ADC 12BIT 41MSPS 44-TQFP
• Manufacturer: Analog Devices Inc

Specifications of AD9042ASTZ

• Data Interface: Parallel
• Number Of Bits: 12
• Sampling Rate (per Second): 41M
• Number Of Converters: 3
• Power Dissipation (max): 735mW
• Voltage Supply Source: Analog and Digital, Dual ±
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 44-TQFP, 44-VQFP
• Resolution (bits): 12bit
• Sampling Rate: 41MSPS
• Input Channel Type: Single Ended
• Supply Voltage Range - Analog: 5V
• Supply Voltage Range - Digital: 5V
• Supply Current: 119mA
• Number Of Elements: 1
• Resolution: 12Bit
• Architecture: Pipelined
• Sample Rate: 41MSPS
• Input Polarity: Unipolar
• Input Type: Voltage
• Rated Input Volt: 1.9/2.9V
• Differential Input: No
• Power Supply Requirement: Single
• Single Supply Voltage (typ): 5V
• Single Supply Voltage (min): 4.75V
• Single Supply Voltage (max): 5.25V
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Power Dissipation: 735mW
• Differential Linearity Error: ±1LSB
• Integral Nonlinearity Error: ±0.75LSB(Typ)
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 44
• Package Type: LQFP
• Input Signal Type: Single-Ended
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

RECEIVE CHAIN FOR DIGITAL AND ANALOG BEAM FORMING MEDICAL ULTRASOUND USING
THE AD9042
The AD9042 is an excellent digitizer for digital and analog beam-
forming medical ultrasound systems. The price/performance ratio
of the AD9042 allows ultrasound designers the luxury of using
state-of-the-art ADCs without jeopardizing their cost budgets.
ADC performance is critical for image quality. The high dynamic
range and excellent noise performance of the AD9042 enable
higher image quality medical ultrasound systems.
Figure 45 shows the AD9042 used in one channel of the receive
chain of a medical ultrasound system. The
input directly from the transducer or from an external preamp
connected to the transducer. The AD604 contains two separate
stages. The first stage is a preamp with a fixed gain (14 dB to
20 dB) selected by a fixed resistor. The second stage is a variable
gain amplifier with the gain set by the
is increased over time to compensate for the attenuation of
signal level in the body.
AD7226
AD604
DAC. The gain
receives its
Rev. B | Page 21 of 24
Following the AD604, a low-pass filter is used to minimize the
amount of noise presented to the ADC. The
buffer the filter from the AD9042 input. This function may not
be required depending on the filter configuration and PCB
partitioning. The digital outputs of the AD9042 are then presented
to the digital system for processing.
TRANSDUCER/
PRE-AMP
INPUT
Figure 45. Using the AD9042 in Ultrasound Applications
+14dB TO +20dB
PRE-AMP
AD7226
AD604
–14dB TO +34dB
VGA
LPF
AD8041
AD8041
AD9042
is used to
AD9042