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參數(shù)資料
| 型號(hào)： | AD526S |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Software Programmable Gain Amplifier |
| 中文描述： | 軟件可編程增益放大器 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 464K |
| 代理商： | AD526S |
AD526
REV. D
–12–
FLOATING-POINT CONVERSION
High resolution converters are used in systems to obtain high
accuracy, improve system resolution or increase dynamic range.
There are a number of high resolution converters available with
throughput rates of 66.6 kHz that can be purchased as a single
component solution; however in order to achieve higher through-
put rates, alternative conversion techniques must be employed.
A floating point A/D converter can improve both throughput
rate and dynamic range of a system.
In a floating point A/D converter (Figure 42), the output data is
presented as a 16-bit word, the lower 12 bits from the A/D
converter form the mantissa and the upper 4 bits from the digi-
tal signal used to set the gain form the exponent. The AD526
programmable gain amplifier in conjunction with the compara-
tor circuit scales the input signal to a range between half scale
and full scale for the maximum usable resolution.
The A/D converter diagrammed in Figure 42 consists of a pair
of AD585 sample/hold amplifiers, a flash converter, a five-range
programmable gain amplifier (the AD526) and a fast 12-bit A/D
converter (the AD7572). The floating-point A/D converter
achieves its high throughput rate of 125 kHz by overlapping the
acquisition time of the first sample/hold amplifier and the set-
tling time of the AD526 with the conversion time of the A/D
converter. The first sample/hold amplifier holds the signal for
the flash autoranger, which determines which binary quantum
the input falls within, relative to full scale. Once the AD526 has
settled to the appropriate level, then the second sample/hold
amplifier can be put into hold which holds the amplified signal
while the AD7572 perform its conversion routine. The acquisi-
tion time for the AD585 is 3
μ
s, and the conversion time for the
AD7572 is 5
μ
s for a total of 8
μ
s, or 125 kHz. This performance
relies on the fast settling characteristics of the AD526 after the
flash autoranging (comparator) circuit quantizes the input sig-
nal. A 16-bit register holds the 3-bit output from the flash autor-
anger and the 12-bit output of the AD7572.
The A/D converter in Figure 42 has a dynamic range of 96 dB.
The dynamic range of a converter is the ratio of the full-scale
input range to the LSB value. With a floating-point A/D con-
verter the smallest value LSB corresponds to the LSB of the
monolithic converter divided by the maximum gain of the PGA.
The floating point A/D converter has a full-scale range of 5 V, a
maximum gain of 16 V/V from the AD526 and a 12-bit A/D
converter; this produces:
LSB = ([FSR/2
N
]/Gain) = ([5 V/4096]/16) = 76
μ
V. The
dynamic range in dBs is based on the log of the ratio of the
full-scale input range to the LSB; dynamic range = 20 log
(5 V/76
μ
V) = 96 dB.
74–
LS174
74–
LS174
74–
LS174
AD7572
LSB
MSB
V
IN
1/6
5
6
+
+
+
+
10k
V
S/H
AD585
2.5MHz
+
+
1
m
s
–15V
1/6
3
4
1/6
1
2
AD526
V
IN
B
F
S
A0 A1 A2
+
+
10k
V
S/H
AD585
74-
123
1/2
CLOCK
125MHz
LM339A
1/4
10k
V
10k
V
10k
V
10k
V
1/4
1/4
1/4
1/4
+5V
1/6
+
+15V
–15V
10
m
F
+
AD588
10
m
F
+15V
–15V
+5V
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
E1
E2
E3
68pF
68pF
BUSY
47
m
F
10
m
F
10
m
F
+15V
–15V
10
m
F
10
m
F
+15V
10
m
F
+5V
+5V
50k
V
30pF
+5V
10
m
F
+15V
–15V
10
m
F
V
IN
+5V
10
m
F
10k
V
+5V
REF
5k
V
2.5k
V
1.25k
V
1.25k
V
1
m
F
1
2
4
5
9
10
3
6
8
12
13
11
1
2
3
11
10
74ALS86
A0
A1
A2
NOTE: ALL BYPASS CAPACITORS ARE 0.1
m
F
Figure 42. Floating-Point A/D Converter
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| AD526SD | 功能描述:IC AMP PGA 10MA 16CDIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 其它有關(guān)文件:TS1854A View All Specifications 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.25 V/µs 增益帶寬積:630kHz -3db帶寬:- 電流 - 輸入偏壓:16nA 電壓 - 輸入偏移:1000µV 電流 - 電源:162µA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 6 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SO 包裝:管件 |
| AD526SD/883B | 制造商:Analog Devices 功能描述:SP Amp Variable Gain Amp Single ±16.5V 16-Pin SBCDIP Tube 制造商:Rochester Electronics LLC 功能描述:SOFTWARE PROG. GAIN AMP - Bulk |
| AD526SD/883B/QUP-3/GDLS | 制造商:Rochester Electronics LLC 功能描述:AD526SD/883B/QUP-3/GDLS - Bulk |
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