AFE5804
www.ti.com .................................................................................................................................................. SBOS442B–JUNE 2008–REVISED NOVEMBER 2008
FULLY-INTEGRATED, 8-CHANNEL ANALOG FRONT-END FOR ULTRASOUND
0.89nV/√Hz, 12-Bit, 40MSPS, 101mW/Channel
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FEATURES
DESCRIPTION
23
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8-Channel Complete Analog Front-End:
LNA, VCA, PGA, LPF, and ADC
Mode Control for Power/Noise Optimization:
The AFE5804 is a complete analog front-end device
specifically designed for ultrasound systems that
require low power and small size.
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•
The AFE5804 consists of eight channels, including a
–
Low Noise (Full-Channel):
0.89nV/√Hz (TGC Mode I)
1.23nV/√Hz (TGC Mode II)
1.03nV/√Hz (PW Mode)
low-noise
attenuator (VCA), programmable gain amplifier
(PGA), low-pass filter (LPF), and 12-bit
amplifier
(LNA),
voltage-controlled
a
analog-to-digital converter (ADC) with low voltage
differential signaling (LVDS) data outputs.
–
Ultra-Low Power:
101mW/Channel (TGC Mode II)
65mW/Channel (CW Mode)
The LNA gain is set for 20dB gain and has excellent
noise and signal handling capabilities, including fast
overload recovery. VCA gain can vary over a 46dB
range with a 0V to 1.2V control voltage common to all
channels of the AFE5804.
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•
Low-Noise Pre-Amp (LNA):
–
–
–
0.75nV/√Hz
20dB Fixed Gain
The PGA can be programmed for gains of 20dB,
25dB, 27dB, and 30dB. The internal low-pass filter
can also be programmed to 12.5MHz or 17MHz.
280mVPP Linear Input Range
Variable-Gain Amplifier:
Gain Control Range: 46dB
–
The LVDS outputs of the ADC reduce the number of
interface lines to an ASIC or FPGA, thereby enabling
the high system integration densities desired for
portable systems. The ADC can either be operated
with internal or external references. The ADC also
features a signal-to-noise ratio (SNR) enhancement
mode that can be useful at high gains.
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•
PGA Gain Settings: 20dB, 25dB, 27dB, 30dB
Low-Pass Filter:
–
–
Selectable BW: 12.5MHz, 17MHz
2nd-Order, Bessel
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•
•
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Gain Error: ±0.5dB
Channel Matching: ±0.25dB
Clamping
The AFE5804 is available in a 15mm × 9mm,
135-ball
BGA
package
that
is
Pb-free
(RoHS-compliant) and green. It is specified for
operation from 0°C to +85°C.
Fast Overload Recovery: Two Clock Cycles
12-Bit Analog-to-Digital Converter:
–
–
–
10MSPS to 50MSPS
69dB SNR at 10MHz
Serial LVDS Interface
SPI
Logic/Controls
LVDS
OUT
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•
Integrated CW Switch Matrix
IN1
Clamp
and
.
.
.
.
12-Bit
ADC
8 Channels
LNA
VCA/PGA
CH1
.
15mm × 9mm, 135-BGA Package:
.
CH8
LPF
IN8
–
Pb-Free (RoHS-Compliant) and Green
Reference
CW Switch Matrix (8´10)
APPLICATIONS
•
Medical Imaging, Ultrasound
AFE5804
IOUT (10)
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Portable Systems
Battery-Powered Systems
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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Infineon is a registered trademark of Infineon Technologies.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated