AD7820LR ,LC2MOS HIGH-SPEED uP-COMPATIBLE 8-BIT ADC WITH TRACK/HOLD FUNCTIONGENERAL DESCRIPTION
The AD7820 is a high speed, microprocessor-compatible 8-bit
analog-to-digit ..
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AD7820KN-AD7820KP-AD7820KR-AD7820LN-AD7820LP-AD7820LR
LC2MOS HIGH-SPEED uP-COMPATIBLE 8-BIT ADC WITH TRACK/HOLD FUNCTION
ANALOG
IEVIICES
ttMs High Speed pp-Compatible
8-8it Mt with Track/Holtl Function
AD7820
FEATURES
Fast Conversion Time: 1.36pa max
Built-ln Track-and-Hold Function
No Missed Codes
No User Trims Required
Single +5V Supply
Ratiometric Operation
No External Clock
Extended Temperature Range Operation
Skinny 20-Pin DIP, SOIC and 20-Terminal
Surface Mount Packages
GENERAL DESCRIPTION
The AD7820 is a high speed, microprocessor-compatible 8-bit
analog-to-digital converter which uses a half-flash conversion
technique to achieve a conversion time of l.36p.s. The converter
has a 0V to + 5V analog input voltage range with a single + 5V
supply.
The half-flash technique consists of 31 comparators, a most
significant 4-bit ADC and a least significant 4-bit ADC. The
input to the AD7820 is tracked and held by the input sampling
circuitry, eliminating the need for an external sample-and-hold
for signals with slew rates less than 100mV/ws.
The part is designed for ease of microprocessor interface with
the AD7820 appearing as a memory location or I/O port without
the need for external interfacing logic. All digital outputs use
latched, three-statc output buffer circuitry to allow direct con-
nection to a microprocessor data bus or system input port. A
non-three state overflow output is also provided to allow cascading
of devices to give higher resolution.
The AD7820 is fabricated in an advanced, all ion-implanted,
high speed, Linear Compatible CMOS (LCZMOS) process and
features a low maximum power dissipation of 75mW. It is available
in 20-pin DIPs, SOICs and in 20-terminal surface mount
packages.
REV. A
Information furnished by Analog Devices is believed to be accurate
and reliable. However, no responsibility is assumed by Analog Devices
for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implica-
tion or otherwise under any patent or patent rights of Analog Devices.
FUNCTIONAL BLOCK DIAGRAM
v.9 ( H " um
Vner i-) " ADC
DBO
DATA our
I‘LSBI
TIMING AND CONTROL NC
CIRCUITRY
w 1 a "
GND MODE Miami E
PRODUCT HIGHLIGHTS
1. Fast Conversion Time
The half-flash conversion technique, coupled with fabrication
on Analog Devices' LCZMOS process, enables very fast con-
version times. The maximum conversion time for the WR-RD
mode is 1.36ws, with 1.6ws the maximum for the RD mode.
2. Total Unadjusted Error
The AD7820 features an excellent total unadjusted error
figure of less than 1/2LSB over the full operating temperature
range. The part is also guaranteed to have no missing codes
over the entire temperature range.
3. Built-In Track-and-Hold
The analog input circuitry uses sampled-data comparators,
which by nature have a built-in track-and-hold function. As
a result, input signals with slew rates up to lOOmV/tts can be
converted to 8-bits without external sample-and-hold. This
corresponds to a 5V peak-to-peak, 7kHz sine-wave signal.
4. Single Supply
Operation from a single + 5V supply with a positive voltage
reference allows operation of the AD7820 in microprocessor
systems without any additional power supplies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703 wa: 710/394-6577
Telex: 924491 Cable: ANALOG NORWOODMASS
HN52-5,14-17
A078hl--SPEtyFltylTlihlS
(Von: +511; hsri+l= +51l;hErl-)=Mlr--sWunless otherwise stated).
All spetrifitatitms u, to u, unless ttthemise spetrified. Specifitatitms apply for
RII Mode (Pin 7 = W)
Imam K VcnioI' L Venic- B, TVcnion C, U Veggie Utm- Cetqdltittqalct-tt,
ACCURACY
Radiation 8 8 8 8 Bits
Toul Unndiuxted tirme2 tl t 1/2 tl 2 1/2 LSBmu
--- -httttlttutttrRegt-tro-o-remt
No Missing Code: In summed ' 8 8 8 Bits
REFERENCE INPUT
IttputResisortce 1.0/4.0 1.0/4.0 1.0/4.0 1.0/4.0 knmin/kn mu
Ilrtzr( ' "ntnttvolugeRange VREF( - Wm) VIEF(‘ Woo bsr(- WDD VIEF( - Won Vmin/vruax
Wsrt -)htrmtvottFtangv GNDNREr( +) GND/WEA +) GND/vm( +1 GND/vm( +1 VminNmu
ANALOG INPUT
luput Voluzekangc leF< - Ward H V1514 - szr( +) 1%rri - Wand +) VRErl - yveEri t) Vmin/Vl‘nu
Inputuaugecurrent :3 t3 :3 t3 “Am:
Input Cnpndnnce’ 45 45 45 45 thyp
L0_GIC INPUTS
cs, V11, E
an 2.4 2.4 2.4 2.4 Vmin
VINL 0.8 0.8 0.8 the Vatax
1m" (ER) 1 1 1 1 " um
Im" (WR) 3 3 3 3 M mu
11m. - 1 _ l - l - 1 M an:
Input thpncitancr' 8 ' 8 8 pF mu Typically 5pF
Vom 3.5 3.5 3.5 3.5 Vmin
VINL 1.5 1.5 l.5 1.5 lex
Im" 200 200 200 200 M max 50 ph typ
Imi. - 1 - 1 - 1 - 1 wh m
Input Capaciuncc’ s ' a 8 pF ml: Typically SpF
LOGIC ouwlrs_
DBO-DBT, OFL, INT
Von 4.0 4.0 4.0 4.0 V min [SOURCE = WM
Voc 0.4 0.4 0.4 0.4 V Inn Isrrm = 1.6mA
1otrr(DBG-DB7) , 3 t 3 , 3 , 3 wh mu Floating Sula Lung:
Output Ctmciance' 8 8 8 8 pF m: Typically SpF
VOL 0.4 0.4 0.4 0.4 v Inn Istrm = 2.6suA
1001 t3 :3 :3 :3 “Ann F1tmtintrstateuaUge
Output Cnpnciunce’ 8 ' g 8 pF mu Typically 5pF
SLEW RATE, TRACKING’ 0.2 0.2 0.2 0.2 V/ws typ
0.1 0.1 0.1 0.1 VIM mu
POWER SUPPLY
vos, , S S 5 Volts : $%for Stxrified
[510mm
Iorf 15 IS 20 20 mAmu ei=ii5--ov
Met Dissipation 40 40 40 40 mW lyp
Ptt-StrpNysettsitivity , 1/4 ' 1/4 A 1/4 , 1/4 LSBmu s l/l6LSBlyp
Voo = w 1 5%
'Tanmtun Ram m u follows:
K.LV:nion: v40'Cto "S'C
H.CVcniom: -40'Ctoo8S'C
T,UV¢niml: -S$'Cm +1251:
‘Toul Unadjusted Emu includes offset, tull-le Ind 1inearityermes.
’Suple w " 2m by Product AaatrarttxttretutuecomNi-.
Spedfnlbus whim tochastgem'thmtt notice.
-2- R EV, A
AD7820
TIMING CHARACTERISTICS‘ iu=+5F,hsr1+l= +51l,%ri-)=Mll--Wu+ssoihemisestated.)
Limit at Limit at
Limit at 25°C Tmh)Tn-x Tm,Tm
Parameter (All Versions) (K, L, B, C Versions) (T , U Versions) Units Conditions/Comments
tess 0 o o nsmin C-STO mm Setup Time
ttses o o o nsmin c-sToR-IyptrRHoid Time
tmyz 70 90 100 ns max a to Delay. Pull-Up
Resistor 5kn.
tau) 1.6 2.0 2.5 us max Conversion Time (RD Mode)
IACC03 tau) + 20 ICRD + 35 tau) + 50 ns max Data Access Time (RD Mode)
tom/ 125 - - ns typ W to INT Delay (RD Mode)
175 225 225 ns max
tmd 60 80 100 ns max Data Hold Time
te 500 600 600 ns min Delay Time between Conversions
tn 600 600 600 ns min Write Pulse Width
50 50 50 us max -
tn, 600 700 700 ns min Delay Time between WR and R_D_ Pulses
tAan' 160 225 250 ns max Data Access Time (WR-RD Mode,
see Fig. 5b)
tru 140 200 225 ns max E to NT Delay
(ml 700 - - ns typ W to INT Delay
1000 1400 1700 ns max
[A0323 70 90 l 10 ns max Data Access Time (WR-RD Mode,
.LitFig._5ta1
[m2 100 130 150 ns max WR to INT Delay (Stand-Alone Operation)
tm 50 65 75 ns max Data Access Time after IN-T
(Stand-Alone Operation)
'Samplc tested " 25°C to ensure compliance. All input control signals are specified with tr= tf= 20as (10% to 90% of + 5V) and timed from a voltage level of 1.6V.
2cL = 50pF.
3Measured with load circuits of Figure l and defined as the time required for an output to cross 0.8V or 2.4V.
'Defined as the time required for the data lines to change 0.5V when loaded with the circuits of Figure 2.
Specifications subject to change without notice.
Test Circuits
DGND I
a. High-Z to VOH
b. High-Zto VOL
Figure 1. Load Circuits for Data Access Time Test
REV. A
DGND I
a. VoH to High-Z
b. VOL t0 High-Z
Figure 2. Load Circuits for Data Hold Time Test
A0782!)
ABSOLUTE MAXIMUM RATINGS'
VDD to GND .................... 0V, + 7V Storage Temperature Range ......... - 65°C to + 150°C
Digital Input Voltage to GND Lead Temperature (Soldering, lOsecs) ........ + 300°C
Glim, Q8 ' JW., 1 ' . R, L ' - 0,3Wvoo +0.3V Power Dissipation (Any Package) to +75''C ..... 450mW
' Digital Output Voltage to GND Derates above + 75°C by ............... 6mWf'C
L (Pins 2-5,9,14-18) .......... -0.3V, Voo +0.3V
Vruw(+)to GND .......... VREF(_): Vos, +0.3V
Vm (-) to GND ............... 0V, Vm (+) *Strcsses above those listed under "Absolute Maximum Ratings" may
VIN to GND ............... - 0.3V, Vor, +0.3V cause permanent damage to the device. This is a stress rating only and
Operating Temperature Range functional operation of the device at these or any other conditions above
_ 40°C to +85°C those indicated in the operational sections of this specification is not
Commercial (K, L Versions) ....... implied. Exposure to absolute maximum rating conditions for extended
Industrial (B, C Versions) ........ -40°C to + 85°C periods may affect device reliability.
Extended (T, U Versions) ........ - 55°C to + 125°C
CAUTION:
ESD (electrostatic discharge) sensitive device The digital control Inputs are diode protected
however, permanent damage may occur on unconnected devices subject to high energy electro-
static fields. Unused devices must be stored in conductive foam or shunts. The protective foam ti)iiiliiiiiiiliililii!e,,lss!,,
should be discharged to the destination socket before devices are inserted. esn aEaiigmiiBiitrSglgg DEVICE
ORDERING GUIDE
Temperature Unadiusted Package
Modell Range Error (Max) Option2
AD7820KN - 40°C to + 85°C 1- lLSB N-20
AD7820LN - 40°C to + 85°C , 1/2LSB N-20
AD7820KP - 40°C to + 85°C t lLSB P-20A
AD7820LP - 40°C to + 85°C t 1/2LSB P-20A
AD7820KR - 40°C to + 85°C t lLSB R-20
AD7820LR - 40°C to + 85°C 1 1/2LSB R-20
AD7820BQ - 40°C to + 85°C t lLSB Q-20
AD7820CQ - 40°C to + 85°C t 1/2LSB Q-20
AD7820TQ - 55°C to + 125°C t lLSB Q-20
AD7820UQ - 55°C to + 125°C t 1/2LSB Q-20
AD7820TE - 55°C to + 125°C t lLSB E-NA
AD7820UE - 55°C to + 125°C t 1/2LSB E-20A
m, order MIL-STD-883, Class B processed parts, add/883B to part number.
Contact your local sales office for military data sheet. For U .S . Standard
Military Drawing (SMD), see DESC drawing #5962-88650.
2E = Leadlcss Catamic Chip Carrier; N = Plastic DIP; P = Plastic Leaded
Chip Carrier; Q -- Cadip; R = SOIC.
PIN CONFIGURATIONS
DIP, SOIC LCCC
" , - El Voo g ii,'t g 3 g
mm B E m: 3 2 :. " "
DB! 1 " 5E
E E 032 a " u m
032 E El 051 IMSB)
DM s AD7820 " 057mm Amszo
us: s AD7320 " one -
E TOP VIEW E WENDY C TOP VIEW " 035 TOP VIEW
an E (Nona Sam E ans MODE T (None Sula) " DB5 (Mann Sula)
MODE E E DB4 E l u 034
E a E a
- g " M " "
INT . Evan“) 'a" ET T 'd
GND " E Vnnl-1 - cr "i" E
uc=uo CONNECT > >
NC = NO CONNECT
-4- REV. A
Typical Performance Charaherishs-h0782il
1c...— couvsnstou TIME- u. 3
LINEAR!“ annon- LBS
SNR- dB
" tfoo--SV
A - Yrer--W
/,' < 1.5 1:52:32.
'Y,' El " , g Im=600ns
VDD=4-75V tlf' i , )s, biss, 525 g
I A , s . g
1.5 g t 1.0
, s v,,,,=s'lps-, “g
d' v =4‘75v "s; 's.
Vm,=5.25V DO 0.5
7 Nc"" "ss,
- ‘00 -so 0 100 IM - 100 - 50 It " 100 150 200 300 400 soo 600 TOO
b- AMBIENT TEMPERATURE- = Ta-AMBIENT TEMPERATURE- = twn- ns
Conversion Time (RD Model) Power Supply Current vs. Temperature Accuracy vs. tvvn
vs. Temperature (not including reference ladder)
" 2.0 2.0 I
vn°=sv
Vero =5v 'a, = 5v “=25
b'mr=sir pr=5V
" 1.451: TS nazs'c "
tp=500ns n ‘m=600ns .
lmxmnl I Im=600ns g
" m 1.0 5 "
g 'ss,. E
" 0.5 0,5
\ 's...,
200 300 409 500 600 700 800 300 400 500 500 700 800 900 o , 2 3 4 5
tan- M tp-ns .,Lss,.v/str VREF‘V
Accuracy vs. tno Accuracy vs. tp Accuracy vs VHEF
[VREF = VREF( +) - VREF (-)l
-35 " m
- 38 l Van = 5V
-40 E "
2 I V =2.4V
0 q sonnet. m"
(n - <
-42 - vrao--q.NN E "s-UC",
-44 p, " , tl _
/ ti ',1,,s'5C.l, g _
-M g Vm,--sv vm=5.25v E 4 \
I: '- lsmu. voor-Irs-s-;
-4a / / E o 5 l. / i',
/A 7. . I 2
_5., g
1 2365710 2030405010100 0 0
-T00 -so 0 50 'tttt 150 -100 -50 0 50 100 150
INPUT FREQUENCY- kHz
ENCODE RATE = 400KHe
INPUTSIGNAI. = 5Vp-p
MEASUREMENT BANDWIDTH = Bolle
Signal-Noise Ratio vs. Input Frequency
REV. A
T. - AMBIENT TEMPERATURE - =
twn, Internal Time Delay vs.
Temperature
TA - AMBIENT TEMPERATURE - 'C
Output Current vs. Temperature
