900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






AVAGO

AEAS-7500 Datasheet Preview

AEAS-7500 Datasheet

Ultra-Precision 16 bit Gray Code Absolute Encoder Module

No Preview Available !

AEAS - 7500
Ultra-Precision 16 bit Gray Code Absolute
Encoder Module
Data Sheet
Description
The encoder IC consists of 13 signal photo diode channels
and 1 monitor photo diode channel and is used for the
optical reading of rotary or linear code carriers (i.e. discs or
www.DataSheet4Us.ccaomles). The photodiodes are accompanied with precision
amplifiers plus additional circuitry.
The monitor channel is used to drive a constant current
source for the highly collimated IR illumination system.
Functional Description
Background
The 13 signal channels are set up as:
1. Two precision defining signals (A0, A09), which are two
90° electrical shifted sine, cosine signals. These signals
are conditioned to be compensated for offset and gain
errors. After conditioningthey areon-chipinterpolated
and computed to a combined absolute 16 bit Gray code,
together with signal channels A1-A11.
2. 11analog(A1-A11)channels,whicharedirectlydigitized
by precision comparators with hysteresis tracking. The
digitized signals are called D1-D11.
3. An internal correction and synchronization module
allows the composition of a true 16 bit gray code by
merging the data bits of (1) and (2) by still keeping the
code monotonic.
4. There is a Gray code correction feature for this encoder.
This Gray code correction can be disabled/enabled by
the pin KORR.
5. The gain and offset conditioning value of the sine and
cosine signals are preloaded on-chip by factory. This
will minimize mechanical sensor misalignment error.
Features
• Two Sine/Cosine true differential outputs with 1024
periods for unit alignment
• Integrated highly collimated illumination system
• 11 digital tracks plus 2 sin/cos tracks generate precise
16 bit Gray code
• Ultra fast, 1µs cycle for serial data output word equals
16MHz
• The 12 bits MSB is functionable up to 12000 RPM, 16
bit up to 1000RPM
• MSB can be inverted for changing the counting direc-
tion
• Monitor track for tracking the light level of the LED
• Watch dog with alarm output pin LERR
• -25 °C to + 85 °C operating temperature
Benefits
• No battery or capacitor required for position detection
during power failure
• Immediate position detection on power up
Applications
• Rotary application up to 16 bits / 360° absolute
position
• Cost effective solution for direct integration into OEM
systems
• Linear positioning system




AVAGO

AEAS-7500 Datasheet Preview

AEAS-7500 Datasheet

Ultra-Precision 16 bit Gray Code Absolute Encoder Module

No Preview Available !

Signal-channels A1-A11
The photocurrent of the photodiodes is fed into a tran-
simpedance amplifier. The analog output of the amplifier
has a voltage swing of(dark/light) about 1.3V. Every output
is transformed by precision comparators into digital signals
(D1-D11). The threshold is at VDD/2(=Analog-reference),
regulated by the monitor channel.
Monitor Channel with LED Control at pins LEDR and LERR
The analog output signal of the monitor channel is regu-
lated by the LED current. An external bipolar transistor(to
be connected by user) sets this level to VDD/2 (control
voltage at pin LEDR). Thus the signal swing of each output
is symmetrical to VDD/2(=Analog-reference)
www.DataSheet4U.com
The error bit at pin LERR is triggered if theVe of the internal
bipolar transistor is larger than VDD/2
Signals Channels A0, A09 with signal conditioning and cali-
bration
These two channels give out a sine and cosine wave, which
are90degreephaseshifted. Thesesignalshaveamplitudes,
which are almost constant due to the LED current monitor-
ing. Due to amplifier mismatch and mechanical misalign-
ment the signals have gain and offset errors. These errors
are eliminated by an adaptive signal conditioning circuitry.
The conditioning values are on-chip preprogrammed by
factory. The analog output signals of A0 and A09 are sup-
plied as true-differential voltage with a peak to peak value
of 2.0V at the pins A09P, A09N, A0P, A0N.
Interpolator for Channels A0,A09
The interpolator generates the digital signals D0,D09 and
D-1 to D-4. The interpolated signals D-1 to D-4 extend
the 12 bit Gray code of the signals D11….D0 to form a 16
bit Gray code.
D0 and D09 are digitized from A0 and A09. The channels
A0-A11 and A09 have very high dynamic bandwidth,
which allows a real time monotone 12Bit Gray code at
12000 RPM.
The interpolated 16 bit Gray code can be used up to
1000RPM only. At more than 1000RPM, only the 12 bit
Gray code from the MSB side can be used.
LSB gray code Correction (Pin KORR)
This function block synchronizes the switching points for
the 11 bit gray code of the digital signals D1 to D11 with
D0 and D09 (digitized signal of A0 and A09).
The accuracy of the complete 12 bit gray is defined by
the precision of the signals D0/D09. As these two signals
are generated by the gain and offset conditioned analog
signals A0 and A09, they are very precise.
This Gray code correction only works for the full 12 bit
(4096 steps per revolution).
The correction is not for the 4 excess interpolated bits of
the 16 bit Gray code. Gray code correction can be switched
on or off by putting the pin KORR =1(on) or =0(off ).
MSBINV and DOUT pins
The serial interface consists of a shift register. The most
significant bit, MSB(D11) will always be sent first to DOUT.
The MSB can be inverted (change code direction) by using
pin MSBINV.
DIN and NSL pins
The Serial input DIN allows the configuration as ring reg-
ister for multiple transmissions or for cascading 2 or more
encoders. DIN is the input of the shift register that shifts
the data to DOUT.
The NSL pin controls the shift register, to switch it between
load (1) or shift(0) mode. Under load mode, DOUT will give
the logic of the MSB, i.e. D11.
Under shift mode (0), coupled with the SCL, the registerwill
be clocked, and gives out the serial word output bit by bit.
As the clock frequency can be up to 16 MHz, the transmis-
sion of the full 16 bit word can be done within 1 µs.
Valid data of DOUT should be read when the SCL clock is
low. Please refer to timing diagram Figure 4.



Part Number AEAS-7500
Description Ultra-Precision 16 bit Gray Code Absolute Encoder Module
Maker AVAGO
PDF Download

AEAS-7500 Datasheet PDF






Similar Datasheet

1 AEAS-7500 Ultra-Precision 16 bit Gray Code Absolute Encoder Module
AVAGO





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy