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| 型號： | EVAL-ADUC7024QSZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 45/104頁 |
| 文件大小： | 0K |
| 描述： | KIT DEV QUICK START ADUC7024 |
| 產(chǎn)品培訓模塊： | ARM7 Applications & Tools Intro to ARM7 Core & Microconverters |
| 設計資源： | ADUC7024 Dev System Schematic/Brd Outline 7024 Gerber Files |
| 標準包裝： | 1 |
| 系列： | QuickStart™ 套件 |
| 類型： | MCU |
| 適用于相關產(chǎn)品： | ADuC7024 |
| 所含物品： | 評估板、電源、纜線、軟件和說明文檔 |
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Data Sheet
ADuC7019/20/21/22/24/25/26/27/28/29
Rev. F | Page 45 of 104
ADC CIRCUIT OVERVIEW
The analog-to-digital converter (ADC) incorporates a fast,
multichannel, 12-bit ADC. It can operate from 2.7 V to 3.6 V
supplies and is capable of providing a throughput of up to
1 MSPS when the clock source is 41.78 MHz. This block
provides the user with a multichannel multiplexer, a differential
track-and-hold, an on-chip reference, and an ADC.
The ADC consists of a 12-bit successive approximation converter
based around two capacitor DACs. Depending on the input
signal configuration, the ADC can operate in one of three modes.
Fully differential mode, for small and balanced signals
Single-ended mode, for any single-ended signals
Pseudo differential mode, for any single-ended signals,
taking advantage of the common-mode rejection offered
by the pseudo differential input
The converter accepts an analog input range of 0 V to VREF when
operating in single-ended or pseudo differential mode. In fully
differential mode, the input signal must be balanced around a
common-mode voltage (VCM) in the 0 V to AVDD range with a
04
95
5-
0
11
AVDD
VCM
0
2VREF
Figure 48. Examples of Balanced Signals in Fully Differential Mode
A high precision, low drift, factory calibrated, 2.5 V reference is
provided on-chip. An external reference can also be connected as
described in the Band Gap Reference section.
Single or continuous conversion modes can be initiated in the
software. An external CONVSTART pin, an output generated from
the on-chip PLA, or a Timer0 or Timer1 overflow can also be
used to generate a repetitive trigger for ADC conversions.
A voltage output from an on-chip band gap reference propor-
tional to absolute temperature can also be routed through the
front-end ADC multiplexer, effectively an additional ADC channel
input. This facilitates an internal temperature sensor channel
that measures die temperature to an accuracy of 3°C.
TRANSFER FUNCTION
Pseudo Differential and Single-Ended Modes
In pseudo differential or single-ended mode, the input range
is 0 V to VREF. The output coding is straight binary in pseudo
differential and single-ended modes with
1 LSB = FS/4096, or
2.5 V/4096 = 0.61 mV, or
610 μV when VREF = 2.5 V
The ideal code transitions occur midway between successive
integer LSB values (that is, 1/2 LSB, 3/2 LSB, 5/2 LSB, … ,
FS 3/2 LSB). The ideal input/output transfer characteristic
is shown in Figure 49.
04
95
5-
0
12
O
UT
P
UT
CO
DE
VOLTAGE INPUT
1111 1111 1111
1111 1111 1110
1111 1111 1101
1111 1111 1100
0000 0000 0011
1LSB
0V
+FS – 1LSB
0000 0000 0010
0000 0000 0001
0000 0000 0000
1LSB =
FS
4096
Figure 49. ADC Transfer Function in Pseudo Differential or Single-Ended Mode
Fully Differential Mode
The amplitude of the differential signal is the difference between
the signals applied to the VIN+ and VIN– input voltage pins (that
is, VIN+ VIN–). The maximum amplitude of the differential
signal is, therefore, –VREF to +VREF p-p (that is, 2 × VREF). This is
regardless of the common mode (CM). The common mode is
the average of the two signals, for example, (VIN+ + VIN–)/2, and
is, therefore, the voltage that the two inputs are centered on.
This results in the span of each input being CM VREF/2. This
voltage has to be set up externally, and its range varies with VREF
(see the Driving the Analog Inputs section).
The output coding is twos complement in fully differential mode
with 1 LSB = 2 VREF/4096 or 2 × 2.5 V/4096 = 1.22 mV when
VREF = 2.5 V. The output result is ±11 bits, but this is shifted by 1
to the right. This allows the result in ADCDAT to be declared as a
signed integer when writing C code. The designed code
transitions occur midway between successive integer LSB values
(that is, 1/2 LSB, 3/2 LSB, 5/2 LSB, … , FS 3/2 LSB). The ideal
input/output transfer characteristic is shown in Figure 50.
04
95
5-
0
13
O
U
T
P
UT
CO
DE
VOLTAGE INPUT (VIN+ – VIN–)
0 1111 1111 1110
0 1111 1111 1100
0 1111 1111 1010
0 0000 0000 0010
0 0000 0000 0000
1 1111 1111 1110
1 0000 0000 0100
1 0000 0000 0010
1 0000 0000 0000
–VREF + 1LSB
+VREF – 1LSB
0LSB
1LSB =
2 × VREF
4096
SIGN
BIT
Figure 50. ADC Transfer Function in Differential Mode
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