AKM AK9231 Dual 12-bit 1msps sar a/d converter Datasheet

[AK9231]
AK9231
Dual 12-Bit 1MSPS SAR A/D Converter
1. General Description
The AK9231 is a 12-bit, 1MSPD, SAR A/D converter. It is housed in a space saving ultra-small package
(16-pin QFN).
2.
Features
□ Simultaneous Sampling 12-bit SAR A/D Converter
□ Sampling Rate: 1MSPS
□ Unipolar Input Range: 0 ~ VDD
□ S/(N+D): 71.25dB(Typ.) at 100kHz Input
□ INL: ±1.25 SB (Max.)
□ DNL: ±1.0 LSB(Max.)
□ Power Consumption: IDD=50mW (fs=1MSPS, VDD= 5V)
□ Power Supply: VDD=2.35 ~ 5.25V
□ Operational Temperature Range: Ta=-40 ~ 105ºC
□ Package: Ultra-small 16-pin QFN (3mm x 3mm) Package
VDD
AIN0
S/H
SAR
Serial I/F
&
Control
Logic
ADC
SCLK
SDO0
SDO1
AIN1
S/H
SAR
CSN
ADC
TEST2
TEST3
VSS
TEST0
TEST1
Figure 1. AK9231 Block Diagram
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3.
Table of Contents
1.
2.
3.
4.
General Description ............................................................................................................................ 1
Features .............................................................................................................................................. 1
Table of Contents ................................................................................................................................ 2
Pin Configurations and Functions ....................................................................................................... 3
4.1. Pin Layout .................................................................................................................................... 3
4.2. Pin Functions ............................................................................................................................... 4
4.3. Handling of Unused Pin ............................................................................................................... 4
5. Absolute Maximum Ratings ................................................................................................................ 5
6. Recommended Operating Conditions................................................................................................. 5
7. Analog Characteristics ........................................................................................................................ 6
8. DC Characteristics .............................................................................................................................. 7
9. Switching Characteristics .................................................................................................................... 7
9.1. Timing Diagram ............................................................................................................................ 7
9.2. Digital I/F ...................................................................................................................................... 8
10. Package .............................................................................................................................................. 9
10.1.
Outline Dimensions .................................................................................................................. 9
10.2.
Marking..................................................................................................................................... 9
11. Ordering Guide.................................................................................................................................. 10
12. Revision History ................................................................................................................................ 10
IMPORTANT NOTICE .............................................................................................................................11
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4. Pin Configurations and Functions
TEST2
NC
NC
11
10
9
SDO1
5
SDO0
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TEST3
6
4
16
Top View
VSS
AIN0
CSN
2
3
15
7
VDD
NC
AK9231NK
2
14
SCK
TEST1
NC
8
1
13
TEST0
AIN1
12
4.1. Pin Layout
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4.2. Pin Functions
Pin No.
Pin Name
I/O
1
TEST0
I
2
TEST1
I
3
4
5
6
7
8
VDD
VSS
SDO0
SDO1
CSN
SCK
O
O
I
I
9
NC
-
10
NC
-
11
TEST2
I
12
TEST3
I
13
AIN1
I
14
NC
-
15
NC
-
Function
TEST0
(Internal pull down: 50kΩ. Typ.)
This pin must be connected to VSS.
TEST1
(Internal pull down: 50kΩ. Typ.)
This pin must be connected to VSS.
Power Supply: 2.35 ~ 5.25V
Ground
Serial Data Output 0
Serial Data Output 1
Chip Select
Serial Clock Input
No Connection.
No internal bonding. This pin must be connected to VSS
No Connection.
No internal bonding. This pin must be connected to VSS
TEST2
(Internal pull down: 50kΩ. Typ.)
This pin must be connected to VSS.
TEST3
(Internal pull down: 50kΩ. Typ.)
This pin must be connected to VSS.
ADC1 Input
No Connection.
No internal bonding. This pin must be connected to VSS
No Connection.
No internal bonding. This pin must be connected to VSS
ADC0 Input
16
AIN0
I
Note:
* 1. Digital input pins (CSN, SCK, TEST0, TEST1, TEST2, TEST3) must not be allowed to float.
4.3. Handling of Unused Pin
Unused I/O pins must be connected appropriately.
Classification Pin Name
Setting
Analog
AIN0, AIN1
VSS
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5.
Absolute Maximum Ratings
(VSS= 0V, * 2)
Parameter
Symbol
Power Supply
VDD
Analog Input Current (AIN+, AIN-)
AIN
Analog Input Voltage
AVIN
Digital Input Current
DIIN
Digital Input Voltage
DVIN
Ambient Operating Temperature
Ta
Storage Temperature
Tstg
Note:
* 2. All voltages are with respect to ground (VSS).
Min.
-0.3
-0.3
-0.3
-40
-65
Max.
6.0
±10
VDD+0.3
±10
VDD+0.3
105
150
Unit
V
mA
V
mA
V
ºC
ºC
WARNING: Operation at or beyond these limits may result in permanent damage to the device. Normal
operation is not guaranteed at these extremes.
6. Recommended Operating Conditions
(VSS= 0V, * 2)
Parameter
Symbol
Min.
Typ.
Power Supply
VDD
2.35
Note:
* 2. All voltages are with respect to ground (VSS).
Max.
5.25
Unit
V
* AKM assumes no responsibility for the usage beyond the conditions in this datasheet.
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7. Analog Characteristics
(Ta = -40 ~ 105ºC; VDD= 2.35 ~ 5.25V; fs= 1MHz; unless otherwise specified)
Parameter
Min.
Typ.
Resolution
12
No Missing Codes
12
Integral Nonlinearity (INL) Error
-1.25
±0.65
Differential Nonlinearity (DNL) Error
-1
+0.4/-0.65
VDD= 2.35 ~ 3.6V
-2.5
±0.5
Offset Error
VDD= 4.75 ~ 5.25V
-2
±0.5
Offset Error Drift
±7
Offset Error match: ADC to ADC
-2
±0.1
Gain Error
-1.75
±0.5
Gain Error Drift
±0.4
Gain Error match: ADC to ADC
-1.75
±0.5
Sampling Dynamics
Throughput Rate
25
Acquisition time
325
tA match
50
Aperture Delay
5
Dynamic Characteristics (fin= 0.5dBFS)
THD
fI= 100kHz
-84
VDD=2.35 ~ 3.6V, fI= 100kHz
69
71.25
S/H
VDD=4.75 ~ 5.25V, fI= 100kHz
70
72.25
VDD=2.35 ~ 3.6V, fI= 100kHz
69
71.25
S/(N+D)
VDD=4.75 ~ 5.25V, fI= 100kHz
70
72.25
SFDR
sine wave 100kHz
85.5
Channel to Channel Isolation
-88
Full power bandwidth
At -3dB
12
Analog Input
Full scale input:
0
Absolute input voltage range
-0.2
Input Capacitance
27
Input leakage Current
-0.3/0.5
Power Supplies
Power Supply Current:
Normal Operation (fs=1MSPS) VDD= 5V
10
Normal Operation (fs=1M SPS) VDD=3V
7.2
Static state VDD= 5V
4.4
Static state VDD= 3V
4.2
Power-Down State
0.1
Invalid conversions after power up or reset
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Max.
1.25
1
2.5
2
2
1.75
1.75
1000
200
Unit
bit
bit
LSB
LSB
LSB
LSB
µV/ºC
LSB
LSB
‘ppm/ºC
LSB
kSPS
nsec
psec
nsec
dB
dB
dB
dB
dB
dB
dB
MHz
VDD
VDD+0.2
V
V
pF
µA
12.3
9.0
5.8
5.5
10
1
mA
mA
mA
mA
µA
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8.
DC Characteristics
(Ta= -40 ~ 105ºC)
Parameter
Symbol
VIH1
VIH2
VIL1
VIL2
VOH
VOL
CL
Iin
Min.
1.8
2.4
VDD-0.2
-
Max.
0.8
0.4
0.4
30
±1
Unit
V
V
V
V
V
V
pF
µA
VDD= 2.35 ~ 3.6V
VDD= 4.75 ~ 5.25V
VDD= 5V
Low-Level Input Voltage
VDD= 3V
High-Level Output Voltage (Iout = -200µA)
Low-Level Output Voltage (Iout = 200µA)
Load Capacitance
Input Leakage Current
(* 3)
Note:
* 3. Except TEST0, TEST1, TEST2 and TEST3 pins. These pins are internally pulled-down. (Typ.50kΩ)
High-Level Input Voltage
9.
Switching Characteristics
(Ta= -40 ~ 105ºC)
Parameter
SCK Clock Frequency
SCK High Pulse Width
(* 4)
SCK Low Pulse Width
(* 4)
Minimum time from bus 3-state to start of next conversion
CSN “↓” to First SCK “↓”
CSN “↓” to DOUT “0” Delay
SCK “↓” to DOUT Valid Delay
SCK “↓” to DOUT Valid
VDD= 3V
Hold time
VDD= 5V
Minimum CS pulse
VDD= 3V
16th SCK“↓” to SDO Hi-Z State
VDD= 5V
Note:
* 4. tSCK = 1/ fSCK
Symbol
fSCK
tSCKH
tSCKL
tq
tCSS
tCSD
tDCD
tDCH1
tDCH2
tCS
tCCZ1
tCCZ2
Min.
Typ.
0.4 x tSCK
0.4 x tSCK
40
10
7
5.5
25
-
Max.
20
25
30
30
20
Unit
MHz
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
9.1. Timing Diagram
1/ throughput
CSN
tCS
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
SCK
D11
SDO
D0
Hi-Z
0
tq
Figure 2. Data Output Timing 1
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VIH
CSN
VIL
tCSS
tSCKL tSCKH
VIH
SCK
VIL
SDO
Hi-Z
tDCH
tDCD
tCSD
0
D1
tCCZ
Hi-Z
D0
50%VDD
Figure 3. Data Output Timing 2
9.2. Digital I/F
The AK9231 starts sampling input signals by a falling edge of the CSN pin and the AD conversion
process is initiated. Converted data is output from the SDOx pin (x= 0 or 1) during the conversion. After a
falling edge of the CSN pin, “0” data (4-bit) is output and then after four falling edges of SCK, AD
converted data (12-bit) is output from the SDOx pin in MSB first.
SDO data becomes Hi-Z on the 16th falling edge of SCK clock and the AD conversion ends. The
AK9231 enters the acquisition phase on the first rising edge of SCK after the 13th falling edge (“b” period
in Figure 4). The CSN pin can be set to “H” after the 16th falling edge of SCK clock. It is necessary not to
start the next conversion by pulling CSN low until the end of the quiet time (tq). Do not put the CSN pin to
“L” during the “tq” period after SDO data becomes Hi-Z. Normally, the CSN pin should not be set to “H”
until “b” timing in Figure 4.
The AD conversion stops and SDO data becomes Hi-Z if the CSN pin is put to “H” during the conversion.
At the same time, the AK9231 enters the acquisition phase. The CSN pin should be set to “L” after
waiting the acquisition time (minimum 325nsec) when re-starting the sampling.
The high level of the digital input is not limited to device VDD. For example, a 5.25V “H” level input is
accepted when the device supply voltage is 2.35V. It enables to connect other systems that have
different power supply level to the digital interface of the AK9231. Also this feature relaxes restriction on
power up sequencing. However, it should be noted that VOH and VOL are dependent on the device
VDD.
tCS
tCONV
b
U
CSN
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1
SCK
tCCZ
tCSS
D11
SU
SDO
D0
0
tq
tCSD
SU
U
1/throughput
Acquisition time
Figure 4. Digital I/F
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10. Package
10.1. Outline Dimensions
16-pin QFN (Unit: mm)
0.75 0.05
C0.35
B
13
16
12
1
8
A
3.00 0.05
5
0.50
0.25 0.05
0.10 M C A B
(0.20)
0 ~ 0.05
0.40 0.05
(0.25)
3.00
1.70 0.10
0.05
1.70 0.10
0.05 C
C
* The exposed pad on the bottom surface of the package must be open or connected to the ground.
10.2. Marking
9231K
YYYXX
Date Code: YYYXX (5 digits)
Year 1digit, Week 2digits
Administration Code 2digits
Pin #1 indication
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11. Ordering Guide
AK9231NK
AKD9231
-40 ~ +105ºC
16pin QFN (3.0mm x 3.0mm, 0.5mm pitch)
Evaluation Board for the AK9231
12. Revision History
Date (Y/M/D)
14/12/09
Revision
00
Reason
First edition
Page
Contents
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[AK9231]
IMPORTANT NOTICE
0. Asahi Kasei Microdevices Corporation (“AKM”) reserves the right to make changes to the
information contained in this document without notice. When you consider any use or
application of AKM product stipulated in this document (“Product”), please make inquiries the
sales office of AKM or authorized distributors as to current status of the Products.
1. All information included in this document are provided only to illustrate the operation and
application examples of AKM Products. AKM neither makes warranties or representations with
respect to the accuracy or completeness of the information contained in this document nor
grants any license to any intellectual property rights or any other rights of AKM or any third party
with respect to the information in this document. You are fully responsible for use of such
information contained in this document in your product design or applications. AKM ASSUMES
NO LIABILITY FOR ANY LOSSES INCURRED BY YOU OR THIRD PARTIES ARISING FROM
THE USE OF SUCH INFORMATION IN YOUR PRODUCT DESIGN OR APPLICATIONS.
2. The Product is neither intended nor warranted for use in equipment or systems that require
extraordinarily high levels of quality and/or reliability and/or a malfunction or failure of which
may cause loss of human life, bodily injury, serious property damage or serious public impact,
including but not limited to, equipment used in nuclear facilities, equipment used in the
aerospace industry, medical equipment, equipment used for automobiles, trains, ships and
other transportation, traffic signaling equipment, equipment used to control combustions or
explosions, safety devices, elevators and escalators, devices related to electric power, and
equipment used in finance-related fields. Do not use Product for the above use unless
specifically agreed by AKM in writing.
3. Though AKM works continually to improve the Product’s quality and reliability, you are
responsible for complying with safety standards and for providing adequate designs and
safeguards for your hardware, software and systems which minimize risk and avoid situations
in which a malfunction or failure of the Product could cause loss of human life, bodily injury or
damage to property, including data loss or corruption.
4. Do not use or otherwise make available the Product or related technology or any information
contained in this document for any military purposes, including without limitation, for the design,
development, use, stockpiling or manufacturing of nuclear, chemical, or biological weapons or
missile technology products (mass destruction weapons). When exporting the Products or
related technology or any information contained in this document, you should comply with the
applicable export control laws and regulations and follow the procedures required by such laws
and regulations. The Products and related technology may not be used for or incorporated into
any products or systems whose manufacture, use, or sale is prohibited under any applicable
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5. Please contact AKM sales representative for details as to environmental matters such as the
RoHS compatibility of the Product. Please use the Product in compliance with all applicable
laws and regulations that regulate the inclusion or use of controlled substances, including
without limitation, the EU RoHS Directive. AKM assumes no liability for damages or losses
occurring as a result of noncompliance with applicable laws and regulations.
6. Resale of the Product with provisions different from the statement and/or technical features set
forth in this document shall immediately void any warranty granted by AKM for the Product and
shall not create or extend in any manner whatsoever, any liability of AKM.
7. This document may not be reproduced or duplicated, in any form, in whole or in part, without
prior written consent of AKM.
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