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PDF AK5806 Data sheet ( Hoja de datos )
| Número de pieza | AK5806 | |
| Descripción | 8ch Analog Front End IC | |
| Fabricantes | AKM | |
| Logotipo |  |
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[AK5806]
AK5806
8ch Analog Front End IC
1. General description
The AK5806 is an 8 channels analog baseband IC with third order HPF, whose cutoff frequency is
variable, and programmable gain amplifiers.
It is capable of adjusting the baseband signal gain and the frequency band widely.
2. Features
- Signal Processing: 8-channel Differential I/O
- Signal band width: up to 5MHz
- Programmable Gain Amplifier:
(Coarse) 0dB to 42dB, 6dB/step (Fine) −6dB to +5.625dB, 0.375dB/step
- 3rd-order HPF with Adjustable Cutoff Frequency: 25 kHz to 1MHz
- Offset Cancelling Function
- Operational Temperature: −40 to 125ºC
- Package: 64-pins HTQFP
3. Application
- Millimeter wave radar
- Laser rangefinder
- Ultrasonic sensor
- Signal conditioning before AD conversion
etc.
4. Block diagram
VDD
AIN1P
AIN1N
AINnP
AINnN
PGA1
HPF
&
Buffer
Ch.2 to Ch.8
PGA2
&
Fine gain
Offset
calibration
Output buffer
AOUT1P
AOUT1N
AOUTnP
AOUTnN
VCOM
IREF
Voltage
reference
016011439-E-00
Reset control
Diagnostic
function
VSS
Figure 1
-1-
SPI control
CSN
CCLK
CDTI
CDTO
RSTN
2016/09
1 page  
[AK5806]
Pin # Pin name I/O Function
44 NC
I No connect pin. Connect to No.45 pin.
45 AIN7P I Analog Signal Input Pin
46 AIN7N I Analog Signal Input Pin
47 NC
I No connect pin. Connect to No.46 pin.
48 NC
I No connect pin. Connect to No.49 pin.
49 AIN6P I Analog Signal Input Pin
50 AIN6N I Analog Signal Input Pin
51 NC
I No connect pin. Connect to No.50 pin.
52 NC
I No connect pin. Connect to No.53 pin.
53 AIN5P I Analog Signal Input Pin
54 AIN5N I Analog Signal Input Pin
55 NC
I No connect pin. Connect to No.54 pin.
56
VCOM
O
Internal Common Voltage Output Pin
This pin should be connected to VSS via a 1.0µF (±10%) ceramic capacitor.
57 IREF
O
Analog Reference Current Output Pin
This pin should be connected to VSS via a 6.8kΩ (±1%) resistor.
58 NC
I No connect pin. Connect to No.59 pin.
59 AIN4P I Analog Signal Input Pin
60 AIN4N I Analog Signal Input Pin
61 NC
I No connect pin. Connect to No.60 pin.
62 NC
I No connect pin. Connect to No.63 pin.
63 AIN3P I Analog Signal Input Pin
64 AIN3N I Analog Signal Input Pin
7. Absolute Maximum Ratings
Item
Min. Max.
Unit Notes
Supply Voltage
−0.3 4.4
V
Digital Input Pin Voltage
−0.3 4.4
V CSN, CDTI, CCLK, RSTN pins
Input/Output Pin Voltage
−0.3 VDD+0.3 (4.4) V
Input Current (Iin)
−10 10
mA Except Power Supply Pin
Storage Temperature
−65 150
°C
- All voltages are with respect to ground at 0V (Reference Voltage).
- If digital output pins are connected to the data bus, the data bus operating voltage should be in the
same range as shown above Input/Output Pin Voltage.
- Operation at or beyond these limits may result in permanent damage to the device.
8. Recommended Operating Conditions
Item Min. Typ.
Supply Voltage (VDD)
3.135 3.300
Operating Temperature Range (Ta)
40
- All voltages are with respect to ground at 0V (Reference Voltage).
Max.
3.465
125
Unit Notes
V
°C
016011439-E-00
-5-
2016/09
5 Page 
[AK5806]
10.7. Offset Cancellation
The AK5806 has an offset cancellation circuit to correct the output offset voltage. Input path for
external signals will be OFF when the offset cancelling is started by register setting. Offset
cancellation value changes as the output offset will be in the range of ±100mV while internal offset
compensation value is kept by registers. Registers for offset cancellation are shown below.
- ENDOFCAL-bit: Offset Cancellation Operation Status Register
- EROF [8:1]-bit: Offset Cancellation Result Status Register; It shows whether the offset cancelling
result is in the correction range or not.
- OFCAL-bit: Offset Cancellation Start Setting Register
- OFCAL_E-bit: Offset Cancellation Function Enable Register; It shows whether the offset cancelling
result is included in the output signal or not.
Offset cancellation sequence is shown below.
μP AK5806
OFCAL_E is set to [1]
OFCAL is set to [1]
ENDOFCAL=[0]
Analog signal path is OFF
Offset cancel start
Offset cancel finish
The result of cancel is
writed to EROF
0.2ms to
～2ms
ENDOFCAL=[1]
ENDOFCAL=[1]
OFCAL is set to [0]
Analog signal path is ON
Read EROF
EROF read
EROF=[0]
EROF result output
Finish
016011439-E-00
EORF inittialized
Figure 10
- 11 -
2016/09
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AK5806.PDF ] | |
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