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PDF AK9223 Data sheet ( Hoja de datos )
| Número de pieza | AK9223 | |
| Descripción | 2ch delta-sigma modulator | |
| Fabricantes | AKM | |
| Logotipo |  |
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[AK9223]
AK9223
Dual 1-Bit, 10MHz, 2nd-Order, ΔΣ Modulat
or
General Description
The AK9223 is a 2ch delta-sigma modulator that achieves 86dB dynamic range. It operates of a 5V power
supply. The AK9223 is available in a space-saving 24-pin TSSOP package.
Features
Resolution: 16-bit
Linearity: 13-bit
Input Voltage Range: ±2.3V
High Accurate Reference Voltage: ±1% (2.5V ±0.025V), ±20ppm/C (typ.)
Gain Error: 0.5% (max.)
2ch ΔΣ Modulator
2ch Input Reference
20MHz OSC
Selectable External Clocks
Power Consumption: 67.5 mW (SEL=1, AVDD = DVDD = 5V)
Power Supply: AVDD = 4.5 to 5.5V、DVDD = 2.7 to 5.5V
Ta = -40 to 105C
Small Package: 24-pin TSSOP (0.65mm pitch)
CH2+
CH2-
REF2
AIN0+
AIN0-
REFI0
AIN1+
AIN1-
REFI1
REFO
AVDD
Second-Order
ΔΣModulator
DVDD
Output
Interface
Circuit
OUT1
OUT2
CLKO
Second-Order
ΔΣModulator
Clock
Select
20MHz
OSC
Oscillator
2.5V
Reference
Voltage
VSS1 VSS2 VSS3 VSS4 VSS5
Figure 1. Block Diagram
CLKI
SEL
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[AK9223]
Analog Characteristics
(Ta = -40C to 105C; AVDD=5V, DVDD=3V, AIN+=0.2V to 4.8V, AIN-=2.5V, REFI=REFO=2.5V
(internal), CLKI= 20MHz, and 16bit Sinc3 filter with OSR =256; unless otherwise specified)
Parameter
Min.
Typ.
Max.
Unit
Resolution
16 -
- Bits
Integral Nonlinearity (INL) VIN = ±2.3Vpp
Error
(Note 5) VIN = ±2.0Vpp
-8 ±3.8
-4 ±1.8
+8 LSB
+4 LSB
Integral Nonlinearity Match
-1
4 LSB
Differential Nonlinearity (DNL) Error
-1 -
+1 LSB
Offset Error
REFI=2.5V
-3 ±1.5
+3 mV
Offset Error Match
- 0.2
2 mV
Offset Error Drift
(Note 6)
-8
1
+8 V /C
Gain Error
(Note 7) Referenced REFI = 2.5V -0.5
±0.02
+0.5 %FSR
Gain Error Match
- 0.1 0.5 %FSR
Gain Error Drift
(Note 8) - ±1.3
- ppm/C
PSRR
- 82
- dB
Analog Input
Full scale Differential Input (AIN+)-(AIN-)
Voltage Range:
AIN- =2.5V
-REFI
-
+REFI
V
Specified Differential Input (AIN+)-(AIN-)
-0.92 x
-
+0.92 x
V
Voltage Range
AIN- =2.5V
REFI
REFI
Absolute Input Voltage Range
0
-
AVDD
V
Input Capacitance
AIN to VSS
-1
- pF
Input Leakage Current
Clock turned off (Note 9)
-1
-
+1 A
Differential Input
Resistance
80 100
120 k
Differential Input
Capacitance
- 2.5
- pF
CMRR
at dc
- 108
- dB
AIN- =2.5V
Vin = ±1.25Vpp at 40kHz
-
117
- dB
Sampling Dynamics
Internal Clock Frequency SEL=1, -40C to +105C
9
10
11 MHz
External Clock Frequency SEL=0
(Note 10)
1
20
24 MHz
Dynamic Characteristics
THD
Vin = ±2.3Vpp at 5kHz
-
-85 -80 dB
SFDR
Vin = ±2.3Vpp at 5kHz
82
86 - dB
S/N
Vin = ±2.3Vpp at 5kHz
88
92 - dB
Vin = ±2.0Vpp at 5kHz
87
91 - dB
S/(N+D)
Vin = ±2.3Vpp at 5kHz
80
84 - dB
Channel to Channel Isolation Vin = ±2.3Vpp at 5kHz
-
100 - dB
Note 5. Integral nonlinearity is defined as the maximum deviation of the line through the end points of the
specified input range.
Note 6. This is the maximum variation referring the offset of Ta = 25C when the temperature range is
from -40 to 105C.
Note 7. Referring the REFI pin (It does not include internal VREF variation)
Note 8. This value does not include temperature drift of the internal VREF.
Note 9. Outgoing current from the AK9223 is defined as “-” polarity.
Note 10. Recommended input range of the external clock is from 16MHz to 24MHz. The range of
1MHz~16MHz and 24MHz~32MHz can also be available with reduced accuracy.
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[AK9223]
■ Digital Filter
Digital data stream is output form the modulator. This data stream should be processed by a digital filter to
obtain an equivalent digital data to the analog input. Transfer function of the simple Sinc3 filter is shown
below.
H(z) =
(11−−���������−���−������1������������
3
)
This filter provides the best output performance with a relatively low number of gates required for
implementation. All the characterizations in this datasheet are done using a Sinc3 filter (OSR = 256,
Output Word Width: 16 bits).
Figure 4 and Figure 5 show the filter characteristics. The location of the first notch is fDATA (=fMOD /
OSR). The -3dB point is located at half the Nyquist frequency or fDATA/4.
Figure 4. Sinc3 Frequency Characteristics (OSR=32)
Figure 5. Sinc3 Frequency Characteristics (OSR=256)
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AK9223.PDF ] | |
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