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PDF MAX2037 Data sheet ( Hoja de datos )
| Número de pieza | MAX2037 | |
| Descripción | Ultrasound Variable Gain Amplifier | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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www.DataSheet4U.com
19-0586; Rev 0; 10/06
EVAALVUAAILTAIOBNLEKIT
Ultrasound Variable-Gain Amplifier
General Description
The MAX2037 8-channel variable-gain amplifier (VGA)
is designed for high linearity, high dynamic range, and
low-noise performance targeting ultrasound imaging
and Doppler applications. Each amplifier features dif-
ferential inputs and outputs and a total gain range of
typically 42dB. In addition, the VGAs offer very low out-
put-referred noise performance suitable for interfacing
with 12-bit ADCs.
The MAX2037 VGA is optimized for less than ±0.25dB
absolute gain error to ensure minimal channel-to-chan-
nel ultrasound beamforming focus error. The device’s
differential outputs are designed to directly drive ultra-
sound ADCs through an external passive anti-aliasing
filter. A switchable clamp is also provided at each ampli-
fier’s outputs to limit the output signals, thereby prevent-
ing ADC overdrive or saturation.
Dynamic performance of the device is optimized to
reduce distortion to support second-harmonic imaging.
The device achieves a second-harmonic distortion
specification of -70dBc at VOUT = 1.5VP-P and fIN =
5MHz, and an ultrasound-specific* two-tone third-order
intermodulation distortion specification of -52dBc at
VOUT = 1.5VP-P and fIN = 5MHz.
The MAX2037 operates from a +5.0V power supply,
consuming only 120mW/channel. The device is avail-
able in a 100-pin TQFP package with an exposed pad-
dle. Electrical performance is guaranteed over a 0°C to
+70°C temperature range.
Applications
Ultrasound Imaging
Sonar
Features
♦ 8-Channel Configuration
♦ High Integration for Ultrasound Imaging
Applications
♦ Pin Compatible with the MAX2038 Ultrasound
VGA Plus CW Doppler Beamformer
♦ Maximum Gain, Gain Range, and Output-Referred
Noise Optimized for Interfacing with 12-Bit ADCs
Maximum Gain of 29.5dB
Total Gain Range of 42dB
22nV/√Hz Ultra-Low Output-Referred Noise at
5MHz
Pin-for-Pin 10-Bit Compatibility Supported By
MAX2035/MAX2036
♦ ±0.25dB Absolute Gain Error
♦ Switchable Output VGA Clamp Eliminating ADC
Overdrive
♦ Fully Differential VGA Outputs for Direct ADC
Drive
♦ Variable Gain Range Achieves 42dB Dynamic
Range
♦ -70dBc HD2 at VOUT = 1.5VP-P and fIN = 5MHz
♦ Two-Tone Ultrasound-Specific* IMD3 of -52dBc at
VOUT = 1.5VP-P and fIN = 5MHz
♦ 120mW Consumption Per Channel
*See the Ultrasound-Specific IMD3 Specification in the
Applications Information section.
VG_CTL+
VG_CTL-
VG_IN1+
VG_IN1-
•
•
•
VG_IN8+
VG_IN8-
PD
Functional Diagram
VCC VREF
MAX2037
-12.5dB TO +29.5dB
50Ω
VGA
50Ω
•• •
•• •
•• •
50Ω
VGA
50Ω
BIAS
CIRCUITRY
VG_CLAMP_MODE
VG_OUT1+
VG_OUT1-
•
•
•
VG_OUT8+
VG_OUT8-
GND EXT_RES
Ordering Information
PART
TEMP
RANGE
PIN-PACKAGE PKG
CODE
MAX2037CCQ-D
0°C to +70°C
100 TQFP-EP†
(14mm x 14mm)
C100E-3
MAX2037CCQ-TD 0°C to +70°C 100 TQFP-EP† C100E-3
(14mm x 14mm)
MAX2037CCQ+D 0°C to +70°C 100 TQFP-EP† C100E-3
(14mm x 14mm)
MAX2037CCQ+TD 0°C to +70°C 100 TQFP-EP† C100E-3
(14mm x 14mm)
†EP = Exposed paddle.
+Denotes lead-free package.
T = Tape-and-reel package.
D = Dry packing.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
www.DataSheet4U.com
Ultrasound Variable-Gain Amplifier
Typical Operating Characteristics (continued)
(Figure 2, VCC = VREF = 4.75V to 5.25V, GND = 0V, PD = 0, VG_CLAMP_MODE = 1, fRF = 5MHz, capacitance to GND at each of the
VGA differential outputs is 60pF, differential capacitance across the VGA outputs is 10pF, RL = 1kΩ, TA = 0°C to +70°C. Typical
values are at VCC = VREF = 5V, TA = +25°C, unless otherwise noted.)
SECOND HARMONIC DISTORTION
vs. GAIN
0
-10 VOUT = 1VP-P DIFFERENTIAL
-20
-30
-40 f = 12MHz
-50
-60
-70
f = 5MHz
-80
-90
-100
-15
-5
f = 2MHz
5 15
GAIN (dB)
25
35
THIRD HARMONIC DISTORTION
vs. GAIN
0
-10 VOUT = 1VP-P DIFFERENTIAL
-20
-30
f = 12MHz
-40
f = 5MHz
-50
-60
-70
-80 f = 2MHz
-90
-100
-15
-5
5 15
GAIN (dB)
25
35
OVERLOAD RECOVERY TIME
MAX2037toc06
f = 5MHz
DIFFERENTIAL
OUTPUT
1.0V/div
OVERLOAD RECOVERY TIME
MAX2037toc07
f = 5MHz
DIFFERENTIAL
OUTPUT
2.0V/div
OUTPUT 1VP-P TO OVERLOAD AND BACK TO 1VP-P
400ns/div
DIFFERENTIAL
INPUT
1.0V/div
OUTPUT 100mVP-P TO OVERLOAD
AND BACK TO 100mVP-P
400ns/div
DIFFERENTIAL
INPUT
2.0V/div
CHANNEL-TO-CHANNEL CROSSTALK
vs. GAIN
-60
VOUT = 1.5VP-P DIFFERENTIAL
-65 f = 10MHz, ADJACENT CHANNELS
-70
-75
-80
-85
-90
-95
-100
-15
-5
5 15 25 35
GAIN (dB)
CHANNEL-TO-CHANNEL CROSSTALK
vs. FREQUENCY
-30
VOUT = 1VP-P DIFFERENTIAL
-40 GAIN = 10dB, ADJACENT CHANNELS
-50
-60
-70
-80
-90
-100
-110
1
10
FREQUENCY (MHz)
100
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
Ultrasound Variable-Gain Amplifier
+V
VIN
ZIN CONTROL
D2, D1, D0
SINGLE CHANNEL
MAX2034
18nF
100nF
SINGLE CHANNEL
VG_CTL+
MAX2037
VG_CTL-
100nF
VGIN_+
50Ω
VGIN_-
VGA
100nF
50Ω
VG_OUT_+
VG_OUT_-
100nF
100nF
100nF
-V
Figure 2. Typical Per-Channel Ultrasound-Imaging Application
TOP VIEW
TO A SINGLE
CHANNEL OF
MAX1436 ADC
Pin Configuration
GND
GND
VGIN3-
VGIN3+
GND
GND
GND
VGIN4-
VGIN4+
GND
GND
GND
EXT_C1
EXT_C2
EXT_C3
VCC
VGIN5-
VGIN5+
GND
GND
GND
VGIN6-
VGIN6+
GND
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
MAX2037
75 VGOUT2-
74 VGOUT2+
73 GND
72 VCC
71 VGOUT3-
70 VGOUT3+
69 GND
68 VGOUT4-
67 VGOUT4+
66 GND
65 GND
64 GND
63 VG_CTL+
62 VG_CTL-
61 VGOUT5-
60 VGOUT5+
59 GND
58 GND
57 VGOUT6-
56 VGOUT6+
55 GND
54 VCC
53 VGOUT7-
52 VGOUT7+
51 GND
TQFP
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX2037.PDF ] | |
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