www.德州仪器.com
产品 预告(展)
NOISEPERFORMANCE
ADS1232
ADS1234
SBAS350–JUNE2005
theads1232/1234offeroutstandingnoiseperformancethatcanbeoptimizedforagivvenfull-scalerangeusing
theon-chipprogrammablegainamplifier,Table1,Table2,Table3,和Table4summarizethetypicalnoise
performancewithinputsshortedexternallyfordifferentgains,dataratesandvoltagereferencevalues.
thermsandpeak-至-peaknoisearereferredtotheinput.theeffectivenumberofbits(enob)isdefinedas:
•
enob=ln(fsr/rmsnoise)/ln(2)
thenoisefreebitsaredefinedas:
•
噪音-freebits=ln(fsr/顶峰-至-peaknoise)/ln(2)
wherefsr(全部-scalerange)=v
REF
/增益
table1.avdd=5v,v
REF
=5v,datarate=10sps
gainrmsnoisepeak-至-peaknoiseenob(rms)噪音-freebits
1
420nv1.79µv23.521.4
2
270nv900nv23.121.4
64
19nv125nv22.019.2
128
17nv110nv21.118.4
table2.avdd=5v,v
REF
=5v,datarate=80sps
gainrmsnoisepeak-至-peaknoiseenob(rms)噪音-freebits
1
1.36µv8.3µv21.819.2
2
850nv5.5µv21.518.8
64
48nv307nv20.618
128
44nv247nv19.717.2
table3.avdd=3v,v
REF
=3v,datarate=10sps
gainrmsnoisepeak-至-peaknoiseenob(rms)噪音-freebits
1
450nv2.8µv22.620
2
325nv1.8µv22.119.7
64
20nv130nv21.218.5
128
18nv115nv20.317.6
table4.avdd=3v,v
REF
=3v,datarate=80sps
gainrmsnoisepeak-至-peaknoiseenob(rms)噪音-freebits
1
2.2µv12µv20.417.9
2
1.2µv6.8µv20.217.8
64
54nv340nv19.717.1
128
48nv254nv18.916.5
7