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부품번호 | DPS9245 기능 |
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기능 | High-resolution ADC With Pga Datasheet 11/00 | ||
제조업체 | LSI Logic Corporation | ||
로고 | |||
전체 28 페이지수
( DataSheet : www.DataSheet4U.com )
DPS9245
High-Resolution ADC
with PGA
Datasheet
The DPS9245 is a versatile, analog front end that combines a high-
resolution 5 megasamples per second (MS/s) 16-bit Analog-to-Digital
Converter (ADC), a built-in reference, and a Programmable Gain
Amplifier (PGA) with resistive input impedance in a 44-pin package.
Figure 1
DPS9245 Block Diagram
RESETB
REFCLK
Differential
Analog In
(INP, INM)
Low-Noise PGA
(7 Settings)
S/H and
ADC
16
OVR_RNG
Data
AD[15:0]
OE
GAIN[2:0]
VREF
The chip includes a digitally-calibrated, pipeline ADC that is calibrated
upon assertion of a simple reset signal. The combination of a low-noise,
high-linearity, high-input impedance buffer (with programmable gain),
wideband S/H, on-board voltage references, and simple digital interface
(16-bit parallel output word synchronous with the master sampling clock),
makes the chip extremely easy to use in a wide variety of systems. The
analog inputs should be driven differentially, and can be AC-coupled or
DC-coupled to a source. Typical applications include high-performance
data acquisition systems, automatic test equipment, and wideband digital
communications receivers present in systems such as wireless
basestations. The performance of the device with respect to linearity and
noise should be considered separately, as indicated by the THD and
SNR specifications provided in this document.
November 2000
Copyright © 1999, 2000 by LSI Logic Corporation. All rights reserved.
www.DataSheet4U.com
1
Table 1
Electrical Specifications (Cont.)
Parameter
Min Typ Max Units
Notes/Conditions
DC Specifications
ADC differential reference 2.375 2.5 2.625
ADC positive reference
– 3.65 –
ADC negative reference
– 1.15 –
Input common mode refer- 2.275
ence (RXCMIN)
2.400
2.525
V Voltage between ADC_REFP
(pin 37) and ADC_REFM
(pin 36)
V Voltage between ADC_REFP
(pin 37) and GND
V Voltage between ADC_REFM
(pin 36) and GND
V Minimum load 50 kΩ to ground
Gain Accuracy Specifications
Gain error
−7.5 – +7.5 %FSR Total gain error of PGA and
ADC (using internal references)
compared to ideal quantizer
with perfect 5.0 V full-scale
range preceded by an ideal
PGA with gain equal to the
nominal values (i.e., 0 dB,
2.9 dB, 5.8 dB, 11.8 dB,
14.8 dB, 17.5 dB, 19.5 dB)
Static Linearity Specifications
DNL
– ±0.5 – LSB At 16-bit level
INL
– ±1.25 –
LSB At 16-bit level
1. Not tested in production, but guaranteed by design or characterization.
2. In the remainder of this document, the PGA gains are often rounded to the nearest integer value.
For example, the GAIN[2:0] = 110 setting is referred to as 15 dB even though its typical value is
14.8 dB.
4 DPS9245 High-Resolution ADC with PGA
4페이지 3. Third-order and 5th-order intermodulation distortion, IM3 and IM5
respectively, are given in dB below carrier – that is, dB below one
tone of the two-tone signal.
Table 4
Dynamic Linearity Specifications for Two-Tone Differential Analog Input
Sample
Rate
[MS/s]
Signal
Frequencies
PGA
Setting
[dB]
Composite
Signal Level at
ADC Input
[dBFS]
4.4 100 kHz, 110 kHz 6
4.4
100 kHz, 110 kHz
20
8.8 100 kHz, 110 kHz 6
8.8
100 kHz, 110 kHz
20
4.4 400 kHz, 410 kHz 6
4.4
400 kHz, 410 kHz
20
8.8 400 kHz, 410 kHz 6
8.8
400 kHz, 410 kHz
20
4.4 890 kHz, 900 kHz 0
8.8 890 kHz, 900 kHz 6
8.8
890 kHz, 900 kHz
20
5.0 1.03 MHz, 1.04 MHz 6
5.0 1.03 MHz, 1.04 MHz 6
5.0 1.03 MHz, 1.04 MHz 20
–0.8
–0.3
–1.8
–1.3
–0.7
–0.2
–1.8
–1.3
–1.9
–3.0
–1.4
–2.4
–2.4
–0.8
IM3
–98 dB typ
–96 dB typ
–97 dB typ
–96 dB typ
–94 dB typ
–92 dB typ
–93 dB typ
–93 dB typ
–89 dB typ
–89 dB typ
–87 dB typ
–82 dB max
–87 dB typ
–84 dB typ
IM5
–101 dB typ
–99 dB typ
–97 dB typ
–98 dB typ
–95 dB typ
–95 dB typ
–96 dB typ
–96 dB typ
–97 dB typ
–98 dB typ
–94 dB typ
–89 dB max
–97 dB typ
–95 dB typ
SNR Specifications for Balanced Differential Analog Input
Table 5 provides SNR specifications for balanced differential analog
input. The following conditions apply:
• 5 MS/s
• VDD = 5.0 V
• VDD_ADIO = 3.3 V
DPS9245 High-Resolution ADC with PGA
7
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